EP3458250B1 - 3d printer with tuned coolant droplets - Google Patents
3d printer with tuned coolant droplets Download PDFInfo
- Publication number
- EP3458250B1 EP3458250B1 EP16902578.0A EP16902578A EP3458250B1 EP 3458250 B1 EP3458250 B1 EP 3458250B1 EP 16902578 A EP16902578 A EP 16902578A EP 3458250 B1 EP3458250 B1 EP 3458250B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fusing
- build
- material layer
- build materials
- onto
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002826 coolant Substances 0.000 title claims description 96
- 239000000463 material Substances 0.000 claims description 244
- 230000005855 radiation Effects 0.000 claims description 156
- 239000003795 chemical substances by application Substances 0.000 claims description 149
- 238000010521 absorption reaction Methods 0.000 claims description 64
- 238000000034 method Methods 0.000 claims description 25
- 238000000151 deposition Methods 0.000 claims description 17
- 230000008021 deposition Effects 0.000 claims description 11
- 239000006229 carbon black Substances 0.000 description 15
- 239000007788 liquid Substances 0.000 description 15
- 239000011149 active material Substances 0.000 description 12
- 239000004094 surface-active agent Substances 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- 238000007726 management method Methods 0.000 description 11
- 239000000049 pigment Substances 0.000 description 11
- 238000003860 storage Methods 0.000 description 11
- 239000000126 substance Substances 0.000 description 10
- 239000002270 dispersing agent Substances 0.000 description 9
- 239000000976 ink Substances 0.000 description 8
- 241000557626 Corvus corax Species 0.000 description 7
- 239000000654 additive Substances 0.000 description 7
- 230000000996 additive effect Effects 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 7
- 239000006184 cosolvent Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- NECRQCBKTGZNMH-UHFFFAOYSA-N 3,5-dimethylhex-1-yn-3-ol Chemical compound CC(C)CC(C)(O)C#C NECRQCBKTGZNMH-UHFFFAOYSA-N 0.000 description 5
- 230000005670 electromagnetic radiation Effects 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000003139 biocide Substances 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000007639 printing Methods 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 238000010792 warming Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000080 wetting agent Substances 0.000 description 4
- PWQNOLAKMCLNJI-KTKRTIGZSA-N 2-[2-[2-[(z)-octadec-9-enoxy]ethoxy]ethoxy]ethyl dihydrogen phosphate Chemical compound CCCCCCCC\C=C/CCCCCCCCOCCOCCOCCOP(O)(O)=O PWQNOLAKMCLNJI-KTKRTIGZSA-N 0.000 description 3
- 238000010146 3D printing Methods 0.000 description 3
- 230000003115 biocidal effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 239000000975 dye Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 235000013980 iron oxide Nutrition 0.000 description 3
- 239000002082 metal nanoparticle Substances 0.000 description 3
- 229940093440 oleth-3-phosphate Drugs 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000006100 radiation absorber Substances 0.000 description 3
- 230000007480 spreading Effects 0.000 description 3
- 238000003892 spreading Methods 0.000 description 3
- NJVOHKFLBKQLIZ-UHFFFAOYSA-N (2-ethenylphenyl) prop-2-enoate Chemical compound C=CC(=O)OC1=CC=CC=C1C=C NJVOHKFLBKQLIZ-UHFFFAOYSA-N 0.000 description 2
- 229920005692 JONCRYL® Polymers 0.000 description 2
- 229920002125 Sokalan® Polymers 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- DMSMPAJRVJJAGA-UHFFFAOYSA-N benzo[d]isothiazol-3-one Chemical compound C1=CC=C2C(=O)NSC2=C1 DMSMPAJRVJJAGA-UHFFFAOYSA-N 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- HNJBEVLQSNELDL-UHFFFAOYSA-N pyrrolidin-2-one Chemical compound O=C1CCCN1 HNJBEVLQSNELDL-UHFFFAOYSA-N 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000007514 turning Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- WAEVWDZKMBQDEJ-UHFFFAOYSA-N 2-[2-(2-methoxypropoxy)propoxy]propan-1-ol Chemical compound COC(C)COC(C)COC(C)CO WAEVWDZKMBQDEJ-UHFFFAOYSA-N 0.000 description 1
- QWGRWMMWNDWRQN-UHFFFAOYSA-N 2-methylpropane-1,3-diol Chemical compound OCC(C)CO QWGRWMMWNDWRQN-UHFFFAOYSA-N 0.000 description 1
- KFGWEMFTDGCYSK-UHFFFAOYSA-N 3-methyl-1,2-thiazole 1-oxide Chemical compound CC=1C=CS(=O)N=1 KFGWEMFTDGCYSK-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000721047 Danaus plexippus Species 0.000 description 1
- 241000422980 Marietta Species 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- ALQSHHUCVQOPAS-UHFFFAOYSA-N Pentane-1,5-diol Chemical compound OCCCCCO ALQSHHUCVQOPAS-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- UWHCKJMYHZGTIT-UHFFFAOYSA-N Tetraethylene glycol, Natural products OCCOCCOCCOCCO UWHCKJMYHZGTIT-UHFFFAOYSA-N 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000000845 anti-microbial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- UHYPYGJEEGLRJD-UHFFFAOYSA-N cadmium(2+);selenium(2-) Chemical compound [Se-2].[Cd+2] UHYPYGJEEGLRJD-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 1
- -1 iron oxide) Chemical class 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 150000003856 quaternary ammonium compounds Chemical class 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- 238000001429 visible spectrum Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/165—Processes of additive manufacturing using a combination of solid and fluid materials, e.g. a powder selectively bound by a liquid binder, catalyst, inhibitor or energy absorber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/245—Platforms or substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/295—Heating elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/307—Handling of material to be used in additive manufacturing
- B29C64/321—Feeding
- B29C64/336—Feeding of two or more materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
- B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
Definitions
- 3D printing In three-dimensional (3D) printing, an additive printing process is often used to make three-dimensional solid parts from a digital model. 3D printing is often used in rapid product prototyping, mold generation, mold master generation, and short-run manufacturing. Some 3D printing techniques are considered additive processes because they involve the application of successive layers of material to an existing surface (template or previous layer). This is unlike traditional machining processes, which often rely upon the removal of material to create the final part. 3D printing often requires curing or fusing of the building material, which for some materials may be accomplished using heat-assisted extrusion, melting, or sintering, and for other materials may be accomplished using digital light projection technology. Document WO 2015/108546 discloses an apparatus for generating a three-dimensional object having an agent distributor to selectively deliver a cooling agent on appropriate portions of build material.
- a 3D printer according to claim 1 a method according to claim 9 for operating a 3D printer and a non-transitory computer readable medium according to claim 14 are disclosed.
- the 3D printer disclosed herein includes a first delivery device to selectively deposit a fusing agent onto a layer of build materials and a second delivery device to deposit coolant droplets at tuned drop weights onto the layer of build materials.
- the 3D printer also includes a controller to control the second delivery device to selectively deposit the coolant droplets at the tuned drop weights onto selected areas of the build material layer, in which the drop weights of the selectively deposited coolant droplets are tuned to provide a thermal balance between multiple areas of the build material layer during application of fusing radiation onto the build material layer.
- the controller tunes the drop weights (or equivalently, drop volumes) of the coolant droplets to a fusing radiation absorption property of the fusing agent. That is, for instance, the controller may tune the drop weights of the coolant droplets according to the fusing radiation absorption rate of the fusing agent.
- the drop weights of the coolant droplets may be tuned such that the coolant droplets may substantially prevent or minimize the fusing of the build materials located adjacent to the build materials that have received the fusing agent and are to be fused together through absorption of fusing radiation while also enabling the unfused build materials to be re-used in subsequent layers.
- the drop weights of the coolant droplets may be tuned such that the coolant droplets deposited onto the build materials sufficiently evaporate during absorption of fusing radiation to enable the unfused build materials to be re-used.
- FIG. 1A With reference first to FIG. 1A , there is shown a simplified isometric view of an example three-dimensional (3D) printer 100 for generating, building, or printing three-dimensional parts. It should be understood that the 3D printer 100 depicted in FIG. 1A may include additional components.
- the 3D printer 100 is depicted as including a build area platform 102, a build material supply 104 containing build materials 106, and a recoater 108.
- the build material supply 104 may be a container or surface that is used to position build materials 106 between the recoater 108 and the build area platform 102.
- the build material supply 104 may be a hopper or a surface upon which the build materials 106 may be supplied, for instance, from a build material source (not shown) located above the build material supply 104.
- the build material supply 104 may include a mechanism to provide, e.g., move, the build materials 106 from a storage location to a position to be spread onto the build area platform 102 or a previously formed layer of build materials 106.
- the build material supply 104 may include a hopper, an auger conveyer, or the like.
- 3D objects or parts are to be generated from the build materials 106 and the build materials 106 may be formed of any suitable material including, but not limited to, polymers, metals, and ceramics.
- the build materials 106 may be in the form of a powder.
- the recoater 108 may move in a direction as denoted by the arrow 110, e.g., along the y-axis, over the build material supply 104 and across the build area platform 102 to spread a layer 114 of the build material 106 over a surface of the build area platform 102.
- the layer 114 may be formed to a substantially uniform thickness across the build area platform 102.
- the thickness of the layer 114 may range from about 90 ⁇ m to about 110 ⁇ m, although thinner or thicker layers may also be used.
- the thickness of the layer 114 may range from about 20 ⁇ m to about 200 ⁇ m, or from about 50 ⁇ m to about 200 ⁇ m.
- the recoater 108 may also be returned to a position adjacent the build material supply 104 following the spreading of the build materials 106.
- the recoater 108 may be a doctor blade, roller, a counter rotating roller, or any other device suitable for spreading the build materials 106 over the build area platform 102.
- the 3D printer 100 is also depicted as including a plurality of warming devices 120 arranged in an array above the build area platform 102.
- Each of the warming devices 120 may be a lamp or other heat source that is used to apply heat onto spread layers of the build materials 106, for instance, to maintain the build materials 106 at or above a predetermined threshold temperature.
- the warming devices 120 may maintain the temperatures of the build materials 106 at a relatively high temperature that facilitates the fusing of the build materials 106 upon which a fusing agent has been mixed or applied.
- the 3D printer 100 is further depicted as including a first delivery device 130 and a second delivery device 132, which may both be scanned across the build area platform 102 in both of the directions indicated by the arrow 137, e.g., along the x-axis.
- the first delivery device 130 and the second delivery device 132 may be, for instance, thermal inkjet printheads, piezoelectric printheads, or the like, and may extend a width of the build area platform 102.
- the first delivery device 130 and the second delivery device 132 have each been depicted in FIG. 1A as being formed of a single device, it should be understood that each of the first delivery device 130 and the second delivery device 132 may include multiple printheads that span the width, e.g., along the y-axis, of the build area platform 102.
- the first delivery device 130 and the second delivery device 132 may also be scanned along the y-axis to thus enable the first delivery device 130 and the second delivery device 132 to be positioned over a majority of the area above the build area platform 102.
- the first delivery device 130 and the second delivery device 132 may thus be attached to a moving XY stage or a translational carriage (neither of which is shown) that is used to move the first delivery device 130 and the second delivery device 132 adjacent to the build area platform 102 in order to deposit respective liquid droplets in predetermined areas of a layer 114 of the build materials 106.
- the first delivery device 130 and the second delivery device 132 may each include a plurality of nozzles through which the respective liquid droplets are to be ejected onto the build material layer 114.
- the liquids are a fusing agent and a coolant
- the first delivery device 130 deposits a fusing agent onto selected areas of the layer of build materials 106 and the second delivery device 132 deposits a coolant onto other selected areas of the layer of build materials 106.
- the first delivery device 130 may deposit multiple fusing agents having different fusing radiation absorption properties, for instance, the multiple fusing agents may have different fusing radiation absorption rates with respect to each other.
- the multiple fusing agents may have different colors with respect to each other, may have different chemical compositions (e.g., different reactants and/or catalysts) with respect to each other, or the like.
- the first delivery device 130 may include multiple printheads, in which each of the multiple printheads may deposit a fusing agent having a different fusing radiation absorption property with respect to the other fusing agents.
- the second delivery device 132 is a device that is able to deliver liquid droplets at variously controlled drop weights (or equivalently, drop volumes).
- the second delivery device 132 may include a printhead or multiple printheads available from HP Inc. of Palo Alto, California. That is, for instance, the second delivery device 132 is controlled to selectively deposit coolant droplets at tuned (or equivalently, determined) drop weights onto selected areas of the layer of build materials 106.
- the drop weights of the coolant droplets is tuned to the fusing radiation absorption properties of the fusing agent deposited on the build materials 106 adjacent to the build materials 106 on which the coolant droplets are to be deposited.
- the drop weights of the coolant droplets may be relatively higher for the coolant droplets that are to be deposited adjacent to build materials 106 that are to receive a fusing agent that has a lower fusing radiation absorption rate than for the coolant droplets that are to deposited adjacent to build materials 106 that are to receive a fusing agent that has a higher fusing radiation absorption rate. This may occur because fusing agents having lower fusing radiation absorption rates may require greater amounts of fusing radiation to cause the build materials 106 to fuse together.
- Various manners in which the drop weights of the coolant droplets may be determined are described in greater detail herein below.
- a first radiation generator 134 and/or a second radiation generator 136 is implemented to apply fusing radiation onto the layer of build materials 106.
- the radiation generator(s) 134, 136 may be activated and moved across the layer 114 of build materials 106, for instance, along the directions indicated by the arrow 137, to apply fusing radiation in the form of light and/or heat onto the build materials 106.
- Examples of the radiation generators 134, 136 may include UV, IR or near-IR curing lamps, IR or near-IR light emitting diodes (LED), halogen lamps emitting in the visible and near-IR range, microwaves, or lasers with desirable electromagnetic wavelengths.
- the types of fusing radiation generators 134, 136 may depend, at least in part, on the type of active material used in the fusing agent. According to an example, the first delivery device 130, the second delivery device 132, the first fusing radiation generator 134, and the second fusing radiation generator 136 may be supported on a carriage (not shown) that may be scanned over the build area platform 102 in the directions denoted by the arrow 137.
- the first radiation generator 134 and/or the second radiation generator 136 may be controlled to apply a greater amount of fusing radiation to areas of the build materials 106 that have received a fusing agent having a lower fusing radiation absorption rate when compared to areas of the build materials 106 that have received a fusing agent having a higher fusing radiation absorption rate.
- the first radiation generator 134 and/or the second radiation generator 136 may be controlled to apply fusing radiation for a longer duration of time over the first section than the second section.
- the areas of the layer 114 of build materials 106 adjacent to the first section may receive coolant droplets having a larger drop weight when compared with the areas of the layer 114 of build materials 106 that are adjacent to the second section because the build materials 106 in the first section may be subjected to greater amounts of fusing radiation.
- the build area platform 102 may be lowered as denoted by the arrow 112, e.g., along the z-axis.
- the recoater 108 may be moved across the build area platform 102 to form a new layer of build materials 106 on top of the previously formed layer.
- the first delivery device 130 may deposit a fusing agent or multiple fusing agents and the second delivery device 132 may deposit coolant droplets onto respective selected areas of the new layer of build materials 106. The above-described process may be repeated until a predetermined number of layers have been formed to fabricate a desired 3D part.
- the first delivery device 130 and the second delivery device 132 may be positioned adjacent to a wiping mechanism 138.
- the wiping mechanism 138 may wipe the nozzles of the first delivery device 130 and the second delivery device 132, as well as the nozzles of additional delivery devices if included in the 3D printer 100.
- the wiping mechanism 138 may be moved to a position in which a surface, such as a cleaning web (not shown), of the wiping mechanism 138 is in contact with the exterior surfaces of the nozzles.
- the wiping mechanism 138 may be moved in the z-direction as noted by the arrow 139 to remove debris such as, build materials 106, liquid, dust, etc., that may be in contact with the exterior surfaces of the first delivery device 130 and the second delivery device 132, to maintain the delivery devices 130, 132 at desired performance levels.
- the 3D printer 100 includes a controller 140 that may control operations of the build area platform 102, the build material supply 104, the recoater 108, the warming devices 120, the first delivery device 130, the second delivery device 132, the fusing radiation generators 134, 136, and the wiping mechanism 138.
- the controller 140 may control actuators (not shown) to control various operations of the 3D printer 100 components.
- the controller 140 may be a computing device, a semiconductor-based microprocessor, a central processing unit (CPU), an application specific integrated circuit (ASIC), and/or other hardware device.
- the controller 140 may be connected to the 3D printer 100 components via communication lines.
- the controller 140 is also depicted as being in communication with a data store 150.
- the data store 150 may include data pertaining to a 3D part to be printed by the 3D printer 100.
- the data may include the locations in each build material layer 114 that the first delivery device 130 is to deposit a fusing agent and that the second delivery device 132 is to deposit coolant droplets to form the 3D part.
- the controller 140 may use the data to control the locations on each of the build material layers 114 that the first delivery device 130 and the second delivery device 132 respectively deposit the fusing agent and the coolant.
- FIG. 1B there is shown a simplified block diagram of a few components of the example 3D printer 100 depicted in FIG. 1A .
- the controller 140, the first delivery device 130, and the second delivery device 132 of the 3D printer 100 are shown in FIG. 1B .
- a layer 160 of the build materials 106 is depicted as being provided on a surface 162, which may generally represent a previously spread layer of build materials 106 or the build area platform 102.
- the controller 140 may control the first delivery device 130 to deposit droplets of a fusing agent 170 onto the build materials 106 in a first section 164 of the build material layer 160.
- controller 140 controls the second delivery device 132 to deposit coolant droplets 172 onto the build materials 106 in a second section 166 of the build material layer 160.
- the first section 164 of the build material layer 160 may be distinguished from the second section 166 of the build material layer 160 by the virtual line 168 depicted in FIG. 1B .
- the first delivery device 130 may be scanned over the build material layer 160 and may be controlled to deposit the fusing agent droplets 170 onto selected areas of the layer 160, including the first section 164 shown in FIG. 1B . That is, the controller 140 may control the first delivery device 130 to deposit the fusing agent 170 onto the build materials 106 that are to be fused together.
- the second delivery device 132 may be scanned over the build material layer 160 and is controlled to deposit the coolant droplets 172 onto selected areas of the layer 160, including the second section 166 shown in FIG. 1B .
- the controller 140 may control the second delivery device 132 to deposit the coolant droplets 172 onto the build materials 106 that are positioned adjacent to the build materials 106 in the first section 164.
- the coolant droplets 172 may be deposited onto the build materials 106 that are not to be fused together but may absorb excess heat through thermal bleeding from the build materials 106 that are to be fused together and/or from fusing radiation applied from either or both of the first and second fusing radiation generators 134, 136.
- the first delivery device 130 may be controlled to deposit the fusing agent droplets 170 during a first pass across the layer 160 and the second delivery device 132 may be controlled to deposit the coolant droplets 172 during a second pass across the layer 160.
- the first delivery device 130 may deposit the fusing agent droplets 170 as the platform or carriage is scanned in a first direction across the layer 160 and the second delivery device 132 may deposit the coolant droplets 172 as the platform or carriage is scanned in a second direction across the layer 160.
- the first delivery device 130 and the second delivery device 132 may be controlled to respectively deposit the fusing agent droplets 170 and the coolant droplets 172 during a common pass.
- the coolant droplets 172 deposited onto the second section 166 are controlled to have drop weights that are tuned to fusing radiation absorption properties of the fusing agent deposited onto the first section 164. That is, the drop weights at which the coolant droplets 172 is deposited is tuned to provide thermal balance between the build materials 106 in the first section and the build materials 106 in the second section during application of fusing radiation onto the build material layer 160.
- thermal balance may be achieved when during application of fusing radiation by either or both of the first and second fusing radiation generators 134, 136, the build materials 106 in the first section 164 are fused together and the build materials 106 in the second section 166 are not fused together.
- thermal balance may be achieved when the coolant droplets 172 are able to sufficiently cool the build materials 106 in the second section 166 to prevent those build materials 106 from fusing together while sufficient fusing radiation is supplied to the build materials 106 in the first section 164 to fuse those build materials 106 together. Additionally, thermal balance may be achieved when following application of the fusing radiation, the build materials 106 in the second section 166 may be reused in a subsequent layer. That is, when there is an insufficient amount of coolant remaining on the build materials 106 in the second section following application of the fusing radiation to enable those build materials 106 to be re-used in a subsequent layer.
- the amount of fusing radiation required to fuse the build materials 106 in the first section 164 together may depend on the fusing radiation absorption properties, e.g., light absorption rates, heat absorption rates, etc., of the fusing agent applied to the build materials 106.
- the fusing radiation absorption properties may vary depending upon the color of the fusing agent. For instance, darker colored fusing agents, such as black inks, may have higher fusing radiation absorption rates than lighter colored fusing agents, such as yellow or cyan inks.
- the fusing radiation absorption properties may vary depending upon the chemical compositions of the fusing agents. For instance, a first fusing agent having a particular additive or catalyst may have a higher fusing radiation absorption rate than a second fusing agent that does not have the particular additive or catalyst or has a different additive or catalyst.
- the fusing agent may include a heat- or radiation-absorbing agent (i.e., an active material).
- the active material may be any suitable material that absorbs heat and/or electromagnetic radiation.
- the active material may be selected to absorb heat and/or any wavelength in the electromagnetic spectrum.
- the electromagnetic radiation absorber may absorb IR radiation (i.e., a wavelength of about 700 nm to about 1 mm, which includes near-IR radiation (i.e., a wavelength of 700 nm to 1.4 ⁇ m)), ultraviolet radiation (i.e., a wavelength of about 10 nm to about 390 nm), visible radiation (i.e., a wavelength from about 390 nm to about 700 nm), microwave radiation (i.e., a wavelength of about 1 mm to 1 about m), radio radiation (i.e., a wavelength from about 1 m to about 1000 m), or a combination thereof.
- IR radiation i.e., a wavelength of about 700 nm to about 1 mm,
- An example of the active material may be a microwave radiation-absorbing susceptor, such as carbon black, graphite, magnetite, and/or various iron oxides. Carbon black may also be used as an IR (including near-IR) radiation absorber. Examples of other suitable radiation absorbers include visible dyes, or IR dyes, or any suitable colorants having radiation absorption bands within the visible spectrum of electromagnetic radiation.
- the fusing agent may be an ink-type formulation including carbon black, such as, for example, the ink formulation commercially known as CM997A available from HP Inc.
- the carbon black may be polymerically dispersed.
- the carbon black pigment may also be self-dispersed within the fusing agent (e.g., by chemically modifying the surface of the carbon black).
- inks including visible light enhancers are dye based colored ink and pigment based colored ink, such as the commercially available inks CE039A and CE042A, available from HP Inc.
- suitable carbon black pigments that may be included in the fusing agent 170 include those manufactured by Mitsubishi Chemical Corporation, Japan (such as, e.g., carbon black No. 2300, No. 900, MCF88, No. 33, No. 40, No. 45, No. 52, MA7, MA8, MA100, and No.
- RAVEN® series manufactured by Columbian Chemicals Company, Marietta, Georgia, (such as, e.g., RAVEN® 5750, RAVEN® 5250, RAVEN® 5000, RAVEN® 3500, RAVEN® 1255, and RAVEN® 700); various carbon black pigments of the REGAL® series, the MOGUL® series, or the MONARCH® series manufactured by Cabot Corporation, Boston, Massachusetts, (such as, e.g., REGAL® 400R, REGAL® 330R, and REGAL® 660R); and various black pigments manufactured by Evonik Degussa Corporation, Parsippany, New Jersey, (such as, e.g., Color Black FW1, Color Black FW2, Color Black FW2V, Color Black FW18, Color Black FW200, Color Black S150, Color Black S160, Color Black S170, PRINTEX® 35, PRINTEX® U, PRINTEX® V, PRINTEX
- the carbon black pigment may be polymerically dispersed within the fusing agent 170 by a polymeric dispersant having a weight average molecular weight ranging from about 12,000 to about 20,000.
- the fusing agent includes the carbon black pigment (which is not surface treated), the polymeric dispersant, and water (with or without a co-solvent).
- an example of the co-solvent may be 2-pyrollidinone.
- the polymeric dispersant may be any styrene acrylate or any polyurethane having its weight average molecular weight ranging from about 12,000 to about 20,000.
- styrene acrylate polymeric dispersant examples include JONCRYL® 671 and JONCRYL® 683 (both available from BASF Corp.).
- a ratio of the carbon black pigment to the polymeric dispersant may range from about 3.0 to about 4.0. In an example, the ratio of the carbon black pigment to the polymeric dispersant is about 3.6.
- the polymeric dispersant may contribute to the carbon black pigment's capability for exhibiting enhanced electromagnetic radiation absorption.
- the fusing agent includes active material or materials, such as metal nanoparticles.
- the metal nanoparticles are silver (Ag), copper (Cu), or zinc (Zn).
- suitable metal nanoparticles include metal alloys (where the metals are selected from, for example, Ag, Au, Cu, Ni, Rh, Ru, Mo, Ta, Ti, Pt, or Pd), metal oxide (e.g., iron oxide), metal coated oxide (e.g., iron oxide coated with Ag, Au or Pt), cadmium selenide, and metal coated silica (e.g., silica coated with Ag or Au).
- the amount of the active material that is present in the fusing agent may range from 0 wt% to about 40 wt% based on the total wt% of the fusing agent. In other examples, the amount of the active material in the fusing agent may range from about 0.3 wt% to 30 wt%, or from about 1 wt% to about 20 wt%. Generally speaking, the active material may provide a balance between the fusing agent having jetting reliability and heat and/or electromagnetic radiation absorbance efficiency.
- the presence of a co-solvent, a surfactant, and/or a dispersant in the fusing agent may assist in obtaining a particular wetting behavior with the build materials 106.
- the fusing agent includes water or other primary solvent, either alone or with the active material.
- the fusing agent may further include a dispersing additive, a surfactant, a co-solvent, a biocide, an anti-kogation agent, and combinations thereof.
- Surfactant(s) may be used to improve the wetting properties and the jettability of the fusing agent.
- suitable surfactants may include a self-emulsifiable, nonionic wetting agent based on acetylenic diol chemistry (e.g., SURFYNOL® SEF from Air Products and Chemicals, Inc.), a nonionic fluorosurfactant (e.g., CAPSTONE® fluorosurfactants from DuPont, previously known as ZONYL FSO), and combinations thereof.
- the surfactant is an ethoxylated low-foam wetting agent (e.g., SURFYNOL® 440 or SURFYNOL® CT-111 from Air Products and Chemical Inc.) or an ethoxylated wetting agent and molecular defoamer (e.g., SURFYNOL® 420 from Air Products and Chemical Inc.).
- ethoxylated low-foam wetting agent e.g., SURFYNOL® 440 or SURFYNOL® CT-111 from Air Products and Chemical Inc.
- ethoxylated wetting agent and molecular defoamer e.g., SURFYNOL® 420 from Air Products and Chemical Inc.
- Still other suitable surfactants include non-ionic wetting agents and molecular defoamers (e.g., SURFYNOL® 104E from Air Products and Chemical Inc.) or water-soluble, non-ionic surfactants (e.g.
- the total amount of surfactant(s) in the fusing agent may range from about 0.5 wt% to about 1.4 wt% based on the total wt% of the fusing agent.
- co-solvent for the water-based fusing agent 170
- co-solvent for the water-based fusing agent 170
- examples of the co-solvent include 1-(2-hydroxyethyl)-2-pyrollidinone, 2-Pyrrolidinone, 1,5-Pentanediol, Triethylene glycol, Tetraethylene glycol, 2-methyl-1,3-propanediol, 1,6-Hexanediol, Tripropylene glycol methyl ether, N-methylpyrrolidone, Ethoxylated Glycerol-1 (LEG-1), and combinations thereof.
- biocides examples include an aqueous solution of 1,2-benzisothiazolin-3-one (e.g., PROXEL® GXL from Arch Chemicals, Inc.), quaternary ammonium compounds (e.g., BARDAC® 2250 and 2280, BARQUAT® 50-65B, and CARBOQUAT® 250-T, all from Lonza Ltd. Corp.), and an aqueous solution of methylisothiazolone (e.g., KORDEK® MLX from The Dow Chemical Co.).
- the biocide or antimicrobial may be added in any amount ranging from about 0.05 wt% to about 0.5 wt% with respect to the total wt% of the fusing agent.
- An anti-kogation agent may be included in the fusing agent.
- Kogation refers to the deposit of dried ink (e.g., fusing agent) on a heating element of a thermal inkjet printhead.
- Anti-kogation agent(s) is/are included to assist in preventing the buildup of kogation.
- Suitable anti-kogation agents include oleth-3-phosphate (e.g., commercially available as CRODAFOSTM O3A or CRODAFOSTM N-3 acid from Croda), or a combination of oleth-3-phosphate and a low molecular weight (e.g., ⁇ 5,000) polyacrylic acid polymer (e.g., commercially available as CARBOSPERSETM K-7028 Polyacrylate from Lubrizol).
- oleth-3-phosphate e.g., commercially available as CRODAFOSTM O3A or CRODAFOSTM N-3 acid from Croda
- a low molecular weight e.g., ⁇ 5,000
- polyacrylic acid polymer e.g., commercially available as CARBOSPERSETM K-7028 Polyacrylate from Lubrizol.
- the total amount of anti-kogation agent(s) in the fusing agent may range from greater than 0.20 wt% to about 0.62 wt% based on the total wt% of the fusing agent.
- the oleth-3-phosphate is included in an amount ranging from about 0.20 wt% to about 0.60 wt%
- the low molecular weight polyacrylic acid polymer is included in an amount ranging from about 0.005 wt% to about 0.015 wt%.
- a single fusing agent may be selectively applied to form the layer of the 3D part, or multiple fusing agents may be selectively applied to form the layer of the 3D part.
- the choice of active materials to assist in the absorption of fusing radiation, co-solvents, surfactants, dispersants, and anti-kogation agents may be deterministically optimized for specific applications and/or materials.
- the controller 140 may determine the drop weights for the coolant droplets 172 to be deposited onto the build materials 106 in the second section 166 based upon the fusing radiation absorption rate of the fusing agent 170 deposited or to be deposited on the build materials 106 in the first section 164. Particularly, as discussed above, the controller 140 may determine the drop weights for the coolant droplets 172 to be drop weights that are to result in the thermal balance between the build materials 106 in the first section 164 and the build materials 106 in the second section 166. In addition, the controller 140 may control the second delivery device 132 to deposit the coolant droplets 172 at the determined drop weights onto the build materials 106 in the second section 166.
- the coolant droplets 172 may be composed of any suitable liquid that is to cool the build materials 106 and to prevent the build materials 106 from fusing together during application of fusing radiation onto the build materials 106.
- the coolant droplets 172 may be composed of a liquid that is to evaporate during application of the fusing radiation.
- the coolant droplets 172 are to be substantially completely evaporated during application of the fusing radiation such that the unfused build materials 106 may be re-used.
- the coolant droplets 172 may include water or other suitable liquid.
- the coolant droplets 172 may include a dispersing additive, a surfactant, a co-solvent, a biocide, an anti-kogation agent, and combinations thereof.
- the various examples of these elements described above with respect to the fusing agent 170 may also be applicable to the coolant droplets 172.
- FIG. 1C there is shown a simplified diagram of the layer 160 following application of fusing radiation 180 from the either or both of the first and second fusing radiation generators 134, 136.
- the build materials 106 in the first section 164 may be fused together, while the build materials 106 in the second section 166 may remain unfused.
- the coolant droplets 172 may prevent the build materials 106 in the second section 166 from fusing together even though the same amount of fusing radiation 180 may have been applied to both the first section 164 and the second section 166.
- the areas 202-206 depicted in FIG. 2 may include different fusing characteristics with respect to each other.
- the build materials 106 in the first area 202 may be provided with a first fusing agent 210
- the build materials 106 in the area 204 may be provided with a second fusing agent 212
- the build materials 106 in the third area 206 may be provided with the first fusing agent 210 and the second fusing agent 212.
- the first fusing agent 210 may have a lower fusing radiation absorption rate than the second fusing agent 212.
- the first fusing agent 210 may have a lighter color than the second fusing agent 212.
- the first fusing agent 210 and the second fusing agent 212 may have different compounds with respect to each other.
- the build materials 106 in the first area 202 that have received the first fusing agent 210 may require a greater amount of fusing radiation to be fused together than the build materials 106 in the second area 204 that have received the second fusing agent 212.
- some of the build materials 106 in the third area 206 that have received the first fusing agent 210 may require a greater amount of fusing radiation to be fused together than other ones of the build materials 106 in the third area 206 that have received the second fusing agent 212.
- the controller 140 may control either or both of the first and second fusing radiation generators 134, 136 to apply a greater amount of fusing radiation onto the first area 202 and the third area 206 as compared with the second area 204 as the first and second fusing radiation generators 134, 136 are scanned over the layer 200 in either or both of the directions indicated by the arrow 137.
- the amount of fusing radiation applied by the first and/or second fusing radiation generators 134, 136 may be varied by varying either or both of the intensity level of the fusing radiation being applied and the duration at which the fusing radiation is applied by the first and/or second fusing radiation generators 134, 136.
- the controller 140 may determine the amount of fusing radiation that is to be applied to each of the first area 202, the second area 204, and the third area 206 based upon the fusing radiation absorption rates of the fusing agents 210, 212 deposited on those respective areas.
- the fusing radiation absorption rates for various ones of the fusing agents may be determined, for instance, through testing, and may be stored in the data store 150.
- the controller 140 may determine the fusing radiation requirements for each of the first area 202 and the second area 204 for the build materials 106 to be fused in those areas based upon the stored fusing radiation absorption rates.
- the controller 140 may access the fusing radiation absorption rates from a source over a network, from a user, etc.
- the controller 140 may determine the amount of fusing radiation to be applied to be based upon the fusing agent 210 requiring the greatest amount of fusing radiation to cause the build materials 106 on which the fusing agent 210 is deposited to be fused together.
- the controller 140 may also determine the drop weights of the coolant droplets 172 ( FIG. 1B ) that are to be respectively deposited onto the build materials 106 that are located adjacent to the first area 202, the second area 204, and the third area 206.
- the controller 140 may predetermine the drop weights of the coolant droplets 172 that may result in the thermal balance or may determine the drop weights in real-time. For instance, the controller 140 may determine the drop weights of the coolant droplets 172 to be drop weights that may result in a thermal balance between the build materials 106 in the areas 202-206 and the build materials 106 in areas adjacent to the those areas 202-206.
- thermal balance may be achieved when during application of fusing radiation by either or both of the first and second fusing radiation generators 134, 136, the build materials 106 in the areas 202-206 are fused together while the build materials 106 adjacent to the areas 202-206 are not fused together. That is, for instance, thermal balance may be achieved when the coolant droplets 172 are of sufficient drop weights to sufficiently cool the build materials 106 adjacent to the areas 202-206 to prevent those build materials 106 from fusing together while sufficient fusing radiation is supplied to the build materials 106 in the areas 202-206 to fuse those build materials 106 together.
- thermal balance may be achieved when following application of the fusing radiation, the build materials 106 in the locations outside of the areas 202-206 may be reused in a subsequent layer. That is, thermal balance may be achieved when there is an insufficient amount of leftover coolant on the build materials 106 to enable those build materials 106 to be re-usable.
- the controller 140 may determine different drop weights of the coolant droplets 172 to be applied to respective locations adjacent to the areas 202-206. For instance, the controller 140 may determine the drop weights of the coolant droplets 172 to be deposited in the locations 218 adjacent to the first area 202 to have a first drop weight. The controller 140 may also determine the drop weights of the coolant droplets 172 to be deposited in the locations 218 adjacent to the second area 204 to have a second drop weight. The controller 140 may further determine the drop weights of the coolant droplets 172 to be deposited in the locations 220 to have the first drop weight.
- the controller 140 may control the first delivery device 130 to deliver the fusing agents 210, 212 onto the selected areas 202-206 of the layer 200 as shown in FIG. 2 .
- the controller 140 may control the second delivery device 132 to deliver the coolant droplets 172 to the selected locations 216-220 at their respective determined drop weights as also shown in FIG. 2 .
- the controller 140 may also control either or both of the first and second fusing radiation generators 134, 136 to apply fusing radiation onto the layer 200 at respectively determined fusing radiation amounts to fuse the build materials 106 in the areas 202-206 while also preventing the build materials 106 outside of the areas 202-206 from being fused together.
- the controller 140 may further control the formation and spreading of further layers of build materials 106 and may repeat the process described above.
- FIG. 3 there is shown a simplified block diagram of an example management apparatus 300 that may be implemented in the 3D printer depicted in FIG. 1A .
- the management apparatus 300 may form part of the 3D printer 100 depicted in FIG. 1A .
- the management apparatus 300 may be a command module or other control system of the 3D printer 100.
- the management apparatus 300 depicted in FIG. 3 may include additional components and that some of the components described herein may be removed and/or modified without departing from a scope of the management apparatus 300 disclosed herein.
- the management apparatus 300 depicted in FIG. 3 is shown as including a controller 140 and a data store 150, which may be the same as the controller 140 and data store 150 depicted in and described above with respect to FIG. 1A .
- the controller 140 and the data store 150 depicted in FIG. 3 are not described in detail and instead, the descriptions of the controller 140 and the data store 150 provided above with respect to the 3D printer 100 are intended to also describe these components with respect to the management apparatus 300.
- the management apparatus 300 may include a computer readable storage medium 310 on which is stored machine readable instructions 312-326 (which may also be termed computer readable instructions) that the controller 140 may execute. More particularly, the controller 140 may fetch, decode, and execute the instructions 312-326 to access data pertaining to a 3D part to be printed 312, determine a fusing radiation absorption level of the fusing agent/access a temperature profile (and a fusing radiation absorption profile) across a build material layer following deposition of the fusing agent 314, determine drop weights (or drop volumes) of coolant droplets to be delivered onto selected areas of the build material layer 316, control a first delivery device to deliver a fusing agent 318, control a second delivery device to deliver coolant droplets at the determined (or tuned) drop weights 320, control a fusing radiation generator to apply selected amounts of fusing radiation 322, control a build area platform 324, and control a recoater 326.
- machine readable instructions 312-326 which may
- the controller 140 may include one or more electronic circuits that include components for performing the functionalities of the instructions 312-326.
- the controller 140 may communicate instruction signals to the various components of the 3D printer 100 via communication lines such that the components may operate in the manners described herein.
- the computer readable storage medium 310 may be any electronic, magnetic, optical, or other physical storage device that contains or stores executable instructions.
- the computer readable storage medium 310 may be, for example, Random Access Memory (RAM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a storage device, an optical disc, and the like.
- RAM Random Access Memory
- EEPROM Electrically Erasable Programmable Read-Only Memory
- the computer readable storage medium 310 may be a non-transitory machine-readable storage medium, where the term "non-transitory" does not encompass transitory propagating signals.
- FIGS. 4 and 5 depict example methods 400 and 500 for maintaining a thermal balance between a set of build materials 106 that receive fusing agent droplets 170 and a second set of build materials 106 that receive coolant droplets 172 during application of fusing radiation onto the first and second sets of build materials 106.
- the methods 400 and 500 may represent generalized illustrations.
- the controller 140 may execute instructions 312 stored on the computer readable storage medium 310 to access data pertaining to a 3D part that is to be printed.
- the controller 140 may access data stored in the data store 150 pertaining to a 3D part that is to be printed.
- the controller 140 may determine the number of layers of build materials 106 that the first delivery device 130 is to form and the locations at which fusing agent droplets 170 is or droplets of multiple fusing agents are to be deposited on each of the respective layers of build materials 106 in order to print the 3D part.
- the controller 140 may further determine the amount of fusing radiation to be supplied onto different locations of each of the layers by the either or both of the first and second fusing radiation generators 134, 136.
- fusing agent droplets 170 may be deposited onto a first set of build materials 106 in a build material layer 160, in which the fusing agent droplets 170 are to facilitate binding of the first set of build materials 106 to each other through absorption of fusing radiation supplied by either or both of the first and second fusing radiation generators 134, 136.
- the controller 140 may execute the instructions 318 to control the first delivery device 130 to deposit the fusing agent droplets 170 onto a first section 164 of the build material layer 160 as shown in FIG. 1B .
- coolant droplets 172 may be deposited at tuned drop weights onto a second set of build materials 106 of the build material layer 160, in which the coolant droplets 172 are tuned to have drop weights that result in a thermal balance between the first set of build materials 106 and the second set of build materials 106 during application of fusing radiation onto the build material layer by either or both of the first and second fusing radiation generators 134, 136.
- the thermal balance between the first set of build materials 106 and the second set of build materials 106 may be achieved in any of the manners discussed above.
- the controller 140 executes the instructions 320 to control the second delivery device 132 to deposit the coolant droplets 172.
- the controller 140 may also determine the locations at which the coolant droplets 172 are to be deposited. For instance, the controller 140 may determine that the coolant droplets 172 are to be deposited onto the build materials 106 that are within a predetermined distance from the edges of the build materials 106. The predetermined distance may be determined through testing of various types of fusing agents and may also be based upon the type of fusing agent being deposited.
- fusing radiation absorption levels of a first set of build materials 106 following deposition of a fusing agent on the first set of build materials 106 is determined. That is, the controller 140 may execute the instructions 314 to determine what the fusing radiation absorption levels of the first set of build materials 106 will likely be following deposition of the fusing agent droplets 170 onto those build materials 106. As discussed above, the controller 140 may determine what the fusing radiation absorption levels will be based upon the fusing radiation absorption properties of the fusing agent. The controller 140 may further determine a fusing radiation absorption profile of the build material layer 160 following deposition of the fusing agent droplets 170. That is, for instance, the controller 140 may determine the predicted fusing radiation absorption rates in various locations of the layer 160 that are likely to exist following application of the fusing agent droplets 170 or droplets of multiple fusing agents onto the layer 160.
- a temperature profile across the build material layer 160 following deposition of the fusing agent droplets 170 may be accessed.
- the temperature profile across the build material layer 160 may be accessed through a direct measurement of the temperatures across the build material layer 160.
- the controller 140 may execute the instructions 314 to access the temperatures across the build material layer 160 as detected by a temperature sensor (not shown).
- the controller 140 may predict the temperature profile of the build material layer 160 based upon the determined locations at which the fusing agent droplets 170 are to be deposited. Thus, for instance, the controller 140 may predict how the temperature may vary across the build material layer 160 depending upon the fusing radiation absorption properties of the fusing agent that is to be deposited onto the layer 160.
- the controller 140 may determine how the temperatures across the layer 160 are predicted to increase following application of fusing radiation onto the layer 160. As discussed above, different areas of the layer 160 may be heated to different temperatures depending upon the fusing radiation absorption rates of the fusing agents deposited on those areas. For instance, a fusing agent with a relatively lower fusing radiation absorption rate may require a higher amount of fusing radiation to cause the build materials 106 upon which the fusing agent has been deposited to become fused together.
- the locations around the areas in which a fusing agent with a relatively lower fusing radiation absorption rate has been deposited may be heated to a higher temperature as compared to locations around areas in which a fusing agent with a relatively higher fusing radiation absorption rate has been deposited.
- the controller 140 may determine the temperature profile based upon the predicted temperature levels at various locations across the layer 160.
- the controller 140 may determine the drop weights (or drop volumes) of the coolant droplets 172 to be selectively deposited onto a second set of build materials 106 to reach a thermal balance between the first set of build materials 106 and the second set of build materials 106. A description of the thermal balance those described above with respect to FIG. 1B .
- the controller 140 may execute the instructions 316 to determine the drop weights of the coolant droplets 172.
- the controller 140 may determine the drop weights (or drop volumes) based upon a determined fusing radiation absorption levels, a determined fusing radiation absorption profile.
- fusing agent droplets 170 may be deposited onto a first set of build materials 106 in a build material layer 160, in which the fusing agent is to facilitate binding of the first set of build materials 106 to each other through absorption of fusing radiation supplied by a fusing radiation generator 134.
- the controller 140 may execute the instructions 318 to control the first delivery device 130 to deposit the fusing agent droplets 170 onto a first section 164 of the build material layer 160 as shown in FIG. 1B . That is, the controller 140 may control the first delivery device 130 to deposit the fusing agent droplets 170 onto areas of the layer 160 that are to form part of a 3D printed part.
- the sequence of at which liquid droplets (e.g., fusing agent droplets and/or coolant droplets), if multiple droplets are deposited, or the order of the liquid drops if different materials are used in each of them, may be optimized for improving resolution/definition between to-be-fused areas and to-be-not-fused areas.
- the order in which the liquid droplets are deposited may be based on relative wicking of the liquid droplets due to differences in viscosity, permeability of the liquid droplets, etc.
- coolant droplets 172 may be selectively deposited onto a second set of build materials 106 in the build material layer 160 at the tuned (or determined) drop weights.
- the controller 140 executes the instructions 320 to control the second delivery device 132 to deposit the coolant droplets 172 at the determined drop weights to achieve thermal balance between the first set and the second set of build materials 164, 166 as discussed above.
- fusing radiation may be applied onto the first section and the second section of the build material layer 160.
- the controller 140 may execute the instructions 322 to control the fusing radiation generator 134, 136 to apply fusing radiation onto the build material layer 160.
- the controller 140 may selectively apply different amounts of fusing radiation onto different areas of the layer 160 depending upon, for instance, the fusing radiation absorption properties of the fusing agents deposited onto those different areas.
- the controller 140 may determine whether an additional layer 160 is to be formed, for instance, based upon accessed information regarding the 3D part to be printed. In response to a determination that an additional layer 160 is to be formed, a next layer of build materials 106 may be spread on top of the previous layer 160, as indicated at block 514. For instance, the controller 140 may execute the instructions 324 to control the build area platform 102 to be moved downward and may execute the instructions 326 to control the recoater 108 to spread build materials 106 across the previous layer 160. In addition, blocks 502-514 may be repeated until no additional layers are to be formed, at which point the method 500 may end, as indicated at block 516.
- Some or all of the operations set forth in the methods 400 and 500 may be contained as utilities, programs, or subprograms, in any desired computer accessible medium.
- the methods 400 and 500 may be embodied by computer programs, which may exist in a variety of forms both active and inactive. For example, they may exist as machine readable instructions, including source code, object code, executable code or other formats. Any of the above may be embodied on a non-transitory computer readable storage medium.
- non-transitory computer readable storage media include computer system RAM, ROM, EPROM, EEPROM, and magnetic or optical disks or tapes. It is therefore to be understood that any electronic device capable of executing the above-described functions may perform those functions enumerated above.
Description
- In three-dimensional (3D) printing, an additive printing process is often used to make three-dimensional solid parts from a digital model. 3D printing is often used in rapid product prototyping, mold generation, mold master generation, and short-run manufacturing. Some 3D printing techniques are considered additive processes because they involve the application of successive layers of material to an existing surface (template or previous layer). This is unlike traditional machining processes, which often rely upon the removal of material to create the final part. 3D printing often requires curing or fusing of the building material, which for some materials may be accomplished using heat-assisted extrusion, melting, or sintering, and for other materials may be accomplished using digital light projection technology. Document
WO 2015/108546 discloses an apparatus for generating a three-dimensional object having an agent distributor to selectively deliver a cooling agent on appropriate portions of build material. - Features of the present disclosure are illustrated by way of example and not limited in the following figure(s), in which like numerals indicate like elements, in which:
-
FIG. 1A shows a simplified isometric view of an example three-dimensional (3D) printer for generating, building, or printing three-dimensional parts; -
FIG. 1B shows a simplified block diagram of a few components of the example 3D printer depicted inFIG. 1A ; -
FIG. 1C shows a simplified diagram of a layer of build materials depicted inFIG. 1B during application of a first fusing radiation and a second fusing radiation from a fusing radiation generator; -
FIG. 2 shows a simplified top view of an example layer of build materials in which multiple 3D part areas may in the process of being formed; -
FIG. 3 shows a simplified block diagram of an example management apparatus that may be implemented in the 3D printer depicted inFIG. 1A ; -
FIGS. 4 and5 , respectively, depict example methods for maintaining a thermal balance between a set of build materials that receive a fusing agent and a second set of build materials that receive coolant droplets during application of fusing radiation onto the first and second sets of build materials. - For simplicity and illustrative purposes, the present disclosure is described by referring mainly to an example thereof. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure. It will be readily apparent however, that the present disclosure may be practiced without limitation to these specific details. In other instances, some methods and structures have not been described in detail so as not to unnecessarily obscure the present disclosure. As used herein, the terms "a" and "an" are intended to denote at least one of a particular element, the term "includes" means includes but not limited to, the term "including" means including but not limited to, and the term "based on" means based at least in part on.
- According to the invention a 3D printer according to
claim 1, a method according to claim 9 for operating a 3D printer and a non-transitory computer readable medium according to claim 14 are disclosed. The 3D printer disclosed herein includes a first delivery device to selectively deposit a fusing agent onto a layer of build materials and a second delivery device to deposit coolant droplets at tuned drop weights onto the layer of build materials. The 3D printer also includes a controller to control the second delivery device to selectively deposit the coolant droplets at the tuned drop weights onto selected areas of the build material layer, in which the drop weights of the selectively deposited coolant droplets are tuned to provide a thermal balance between multiple areas of the build material layer during application of fusing radiation onto the build material layer. - According to the invention, the controller tunes the drop weights (or equivalently, drop volumes) of the coolant droplets to a fusing radiation absorption property of the fusing agent. That is, for instance, the controller may tune the drop weights of the coolant droplets according to the fusing radiation absorption rate of the fusing agent. In one regard, the drop weights of the coolant droplets may be tuned such that the coolant droplets may substantially prevent or minimize the fusing of the build materials located adjacent to the build materials that have received the fusing agent and are to be fused together through absorption of fusing radiation while also enabling the unfused build materials to be re-used in subsequent layers. Thus, for instance, the drop weights of the coolant droplets may be tuned such that the coolant droplets deposited onto the build materials sufficiently evaporate during absorption of fusing radiation to enable the unfused build materials to be re-used.
- With reference first to
FIG. 1A , there is shown a simplified isometric view of an example three-dimensional (3D)printer 100 for generating, building, or printing three-dimensional parts. It should be understood that the3D printer 100 depicted inFIG. 1A may include additional components. - The
3D printer 100 is depicted as including abuild area platform 102, abuild material supply 104 containingbuild materials 106, and arecoater 108. Thebuild material supply 104 may be a container or surface that is used to positionbuild materials 106 between therecoater 108 and thebuild area platform 102. Thebuild material supply 104 may be a hopper or a surface upon which thebuild materials 106 may be supplied, for instance, from a build material source (not shown) located above thebuild material supply 104. Additionally, or alternatively, thebuild material supply 104 may include a mechanism to provide, e.g., move, thebuild materials 106 from a storage location to a position to be spread onto thebuild area platform 102 or a previously formed layer ofbuild materials 106. For instance, thebuild material supply 104 may include a hopper, an auger conveyer, or the like. Generally speaking, 3D objects or parts are to be generated from thebuild materials 106 and thebuild materials 106 may be formed of any suitable material including, but not limited to, polymers, metals, and ceramics. In addition, thebuild materials 106 may be in the form of a powder. - The
recoater 108 may move in a direction as denoted by thearrow 110, e.g., along the y-axis, over thebuild material supply 104 and across thebuild area platform 102 to spread alayer 114 of thebuild material 106 over a surface of thebuild area platform 102. Thelayer 114 may be formed to a substantially uniform thickness across thebuild area platform 102. In an example, the thickness of thelayer 114 may range from about 90 µm to about 110 µm, although thinner or thicker layers may also be used. For example, the thickness of thelayer 114 may range from about 20 µm to about 200 µm, or from about 50 µm to about 200 µm. Therecoater 108 may also be returned to a position adjacent thebuild material supply 104 following the spreading of thebuild materials 106. Therecoater 108 may be a doctor blade, roller, a counter rotating roller, or any other device suitable for spreading thebuild materials 106 over thebuild area platform 102. - The
3D printer 100 is also depicted as including a plurality ofwarming devices 120 arranged in an array above thebuild area platform 102. Each of thewarming devices 120 may be a lamp or other heat source that is used to apply heat onto spread layers of thebuild materials 106, for instance, to maintain thebuild materials 106 at or above a predetermined threshold temperature. According to an example, thewarming devices 120 may maintain the temperatures of thebuild materials 106 at a relatively high temperature that facilitates the fusing of thebuild materials 106 upon which a fusing agent has been mixed or applied. - The
3D printer 100 is further depicted as including afirst delivery device 130 and asecond delivery device 132, which may both be scanned across thebuild area platform 102 in both of the directions indicated by thearrow 137, e.g., along the x-axis. Thefirst delivery device 130 and thesecond delivery device 132 may be, for instance, thermal inkjet printheads, piezoelectric printheads, or the like, and may extend a width of thebuild area platform 102. Although thefirst delivery device 130 and thesecond delivery device 132 have each been depicted inFIG. 1A as being formed of a single device, it should be understood that each of thefirst delivery device 130 and thesecond delivery device 132 may include multiple printheads that span the width, e.g., along the y-axis, of thebuild area platform 102. - In other examples in which the
first delivery device 130 and thesecond delivery device 132 do not extend the width of thebuild area platform 102, thefirst delivery device 130 and thesecond delivery device 132 may also be scanned along the y-axis to thus enable thefirst delivery device 130 and thesecond delivery device 132 to be positioned over a majority of the area above thebuild area platform 102. Thefirst delivery device 130 and thesecond delivery device 132 may thus be attached to a moving XY stage or a translational carriage (neither of which is shown) that is used to move thefirst delivery device 130 and thesecond delivery device 132 adjacent to thebuild area platform 102 in order to deposit respective liquid droplets in predetermined areas of alayer 114 of thebuild materials 106. - Although not shown, the
first delivery device 130 and thesecond delivery device 132 may each include a plurality of nozzles through which the respective liquid droplets are to be ejected onto thebuild material layer 114. According to the invention, the liquids are a fusing agent and a coolant, and thefirst delivery device 130 deposits a fusing agent onto selected areas of the layer ofbuild materials 106 and thesecond delivery device 132 deposits a coolant onto other selected areas of the layer ofbuild materials 106. In other examples, thefirst delivery device 130 may deposit multiple fusing agents having different fusing radiation absorption properties, for instance, the multiple fusing agents may have different fusing radiation absorption rates with respect to each other. By way of example, the multiple fusing agents may have different colors with respect to each other, may have different chemical compositions (e.g., different reactants and/or catalysts) with respect to each other, or the like. In the example in which thefirst delivery device 130 deposits multiple fusing agents, thefirst delivery device 130 may include multiple printheads, in which each of the multiple printheads may deposit a fusing agent having a different fusing radiation absorption property with respect to the other fusing agents. - According to the invention, and as discussed in greater detail herein below, the
second delivery device 132 is a device that is able to deliver liquid droplets at variously controlled drop weights (or equivalently, drop volumes). For instance, thesecond delivery device 132 may include a printhead or multiple printheads available from HP Inc. of Palo Alto, California. That is, for instance, thesecond delivery device 132 is controlled to selectively deposit coolant droplets at tuned (or equivalently, determined) drop weights onto selected areas of the layer ofbuild materials 106. The drop weights of the coolant droplets is tuned to the fusing radiation absorption properties of the fusing agent deposited on thebuild materials 106 adjacent to thebuild materials 106 on which the coolant droplets are to be deposited. For instance, the drop weights of the coolant droplets may be relatively higher for the coolant droplets that are to be deposited adjacent to buildmaterials 106 that are to receive a fusing agent that has a lower fusing radiation absorption rate than for the coolant droplets that are to deposited adjacent to buildmaterials 106 that are to receive a fusing agent that has a higher fusing radiation absorption rate. This may occur because fusing agents having lower fusing radiation absorption rates may require greater amounts of fusing radiation to cause thebuild materials 106 to fuse together. Various manners in which the drop weights of the coolant droplets may be determined are described in greater detail herein below. - Following deposition of the fusing agent(s) and the tuned coolant droplets onto selected areas of the layer of the
build materials 106, afirst radiation generator 134 and/or asecond radiation generator 136 is implemented to apply fusing radiation onto the layer ofbuild materials 106. Particularly, for instance, the radiation generator(s) 134, 136 may be activated and moved across thelayer 114 ofbuild materials 106, for instance, along the directions indicated by thearrow 137, to apply fusing radiation in the form of light and/or heat onto thebuild materials 106. Examples of theradiation generators radiation generators first delivery device 130, thesecond delivery device 132, the firstfusing radiation generator 134, and the secondfusing radiation generator 136 may be supported on a carriage (not shown) that may be scanned over thebuild area platform 102 in the directions denoted by thearrow 137. - According to an example, the
first radiation generator 134 and/or thesecond radiation generator 136 may be controlled to apply a greater amount of fusing radiation to areas of thebuild materials 106 that have received a fusing agent having a lower fusing radiation absorption rate when compared to areas of thebuild materials 106 that have received a fusing agent having a higher fusing radiation absorption rate. By way of particular example in which a first fusing agent having a lower fusing radiation absorption rate is deposited on a first section of thelayer 114 ofbuild materials 106 and a second fusing agent having a higher fusing radiation absorption rate is deposited on a second section of the layer ofbuild materials 106, thefirst radiation generator 134 and/or thesecond radiation generator 136 may be controlled to apply fusing radiation for a longer duration of time over the first section than the second section. In this example, the areas of thelayer 114 ofbuild materials 106 adjacent to the first section may receive coolant droplets having a larger drop weight when compared with the areas of thelayer 114 ofbuild materials 106 that are adjacent to the second section because thebuild materials 106 in the first section may be subjected to greater amounts of fusing radiation. - Following application of the fusing radiation to fuse selected sections of the
build materials 106 together, thebuild area platform 102 may be lowered as denoted by thearrow 112, e.g., along the z-axis. In addition, therecoater 108 may be moved across thebuild area platform 102 to form a new layer ofbuild materials 106 on top of the previously formed layer. Moreover, thefirst delivery device 130 may deposit a fusing agent or multiple fusing agents and thesecond delivery device 132 may deposit coolant droplets onto respective selected areas of the new layer ofbuild materials 106. The above-described process may be repeated until a predetermined number of layers have been formed to fabricate a desired 3D part. - Additionally, following a liquid deposition operation across a build material layer or following multiple liquid deposition operations across multiple build material layers, the
first delivery device 130 and thesecond delivery device 132 may be positioned adjacent to awiping mechanism 138. Thewiping mechanism 138 may wipe the nozzles of thefirst delivery device 130 and thesecond delivery device 132, as well as the nozzles of additional delivery devices if included in the3D printer 100. Thewiping mechanism 138 may be moved to a position in which a surface, such as a cleaning web (not shown), of thewiping mechanism 138 is in contact with the exterior surfaces of the nozzles. Thewiping mechanism 138 may be moved in the z-direction as noted by thearrow 139 to remove debris such as, buildmaterials 106, liquid, dust, etc., that may be in contact with the exterior surfaces of thefirst delivery device 130 and thesecond delivery device 132, to maintain thedelivery devices - As further shown in
FIG. 1A , the3D printer 100 includes acontroller 140 that may control operations of thebuild area platform 102, thebuild material supply 104, therecoater 108, the warmingdevices 120, thefirst delivery device 130, thesecond delivery device 132, the fusingradiation generators wiping mechanism 138. Particularly, for instance, thecontroller 140 may control actuators (not shown) to control various operations of the3D printer 100 components. Thecontroller 140 may be a computing device, a semiconductor-based microprocessor, a central processing unit (CPU), an application specific integrated circuit (ASIC), and/or other hardware device. Although not shown, thecontroller 140 may be connected to the3D printer 100 components via communication lines. - The
controller 140 is also depicted as being in communication with adata store 150. Thedata store 150 may include data pertaining to a 3D part to be printed by the3D printer 100. For instance, the data may include the locations in eachbuild material layer 114 that thefirst delivery device 130 is to deposit a fusing agent and that thesecond delivery device 132 is to deposit coolant droplets to form the 3D part. In one example, thecontroller 140 may use the data to control the locations on each of thebuild material layers 114 that thefirst delivery device 130 and thesecond delivery device 132 respectively deposit the fusing agent and the coolant. - With reference now to
FIG. 1B , there is shown a simplified block diagram of a few components of theexample 3D printer 100 depicted inFIG. 1A . Particularly, thecontroller 140, thefirst delivery device 130, and thesecond delivery device 132 of the3D printer 100 are shown inFIG. 1B . In addition, alayer 160 of thebuild materials 106 is depicted as being provided on asurface 162, which may generally represent a previously spread layer ofbuild materials 106 or thebuild area platform 102. As shown, thecontroller 140 may control thefirst delivery device 130 to deposit droplets of afusing agent 170 onto thebuild materials 106 in afirst section 164 of thebuild material layer 160. In addition, thecontroller 140 controls thesecond delivery device 132 to deposit coolant droplets 172 onto thebuild materials 106 in asecond section 166 of thebuild material layer 160. Thefirst section 164 of thebuild material layer 160 may be distinguished from thesecond section 166 of thebuild material layer 160 by thevirtual line 168 depicted inFIG. 1B . - According to an example, the
first delivery device 130 may be scanned over thebuild material layer 160 and may be controlled to deposit the fusingagent droplets 170 onto selected areas of thelayer 160, including thefirst section 164 shown inFIG. 1B . That is, thecontroller 140 may control thefirst delivery device 130 to deposit thefusing agent 170 onto thebuild materials 106 that are to be fused together. Likewise, thesecond delivery device 132 may be scanned over thebuild material layer 160 and is controlled to deposit the coolant droplets 172 onto selected areas of thelayer 160, including thesecond section 166 shown inFIG. 1B . That is, thecontroller 140 may control thesecond delivery device 132 to deposit the coolant droplets 172 onto thebuild materials 106 that are positioned adjacent to thebuild materials 106 in thefirst section 164. Thus, for instance, the coolant droplets 172 may be deposited onto thebuild materials 106 that are not to be fused together but may absorb excess heat through thermal bleeding from thebuild materials 106 that are to be fused together and/or from fusing radiation applied from either or both of the first and second fusingradiation generators - In examples in which the
first delivery device 130 and thesecond delivery device 132 are supported on a common platform or carriage, thefirst delivery device 130 may be controlled to deposit the fusingagent droplets 170 during a first pass across thelayer 160 and thesecond delivery device 132 may be controlled to deposit the coolant droplets 172 during a second pass across thelayer 160. For instance, thefirst delivery device 130 may deposit the fusingagent droplets 170 as the platform or carriage is scanned in a first direction across thelayer 160 and thesecond delivery device 132 may deposit the coolant droplets 172 as the platform or carriage is scanned in a second direction across thelayer 160. In other examples, however, thefirst delivery device 130 and thesecond delivery device 132 may be controlled to respectively deposit the fusingagent droplets 170 and the coolant droplets 172 during a common pass. - According to an example, the coolant droplets 172 deposited onto the
second section 166 are controlled to have drop weights that are tuned to fusing radiation absorption properties of the fusing agent deposited onto thefirst section 164. That is, the drop weights at which the coolant droplets 172 is deposited is tuned to provide thermal balance between thebuild materials 106 in the first section and thebuild materials 106 in the second section during application of fusing radiation onto thebuild material layer 160. By way of example, thermal balance may be achieved when during application of fusing radiation by either or both of the first and second fusingradiation generators build materials 106 in thefirst section 164 are fused together and thebuild materials 106 in thesecond section 166 are not fused together. That is, for instance, thermal balance may be achieved when the coolant droplets 172 are able to sufficiently cool thebuild materials 106 in thesecond section 166 to prevent those buildmaterials 106 from fusing together while sufficient fusing radiation is supplied to thebuild materials 106 in thefirst section 164 to fuse those buildmaterials 106 together. Additionally, thermal balance may be achieved when following application of the fusing radiation, thebuild materials 106 in thesecond section 166 may be reused in a subsequent layer. That is, when there is an insufficient amount of coolant remaining on thebuild materials 106 in the second section following application of the fusing radiation to enable those buildmaterials 106 to be re-used in a subsequent layer. - The amount of fusing radiation required to fuse the
build materials 106 in thefirst section 164 together may depend on the fusing radiation absorption properties, e.g., light absorption rates, heat absorption rates, etc., of the fusing agent applied to thebuild materials 106. By way of example, the fusing radiation absorption properties may vary depending upon the color of the fusing agent. For instance, darker colored fusing agents, such as black inks, may have higher fusing radiation absorption rates than lighter colored fusing agents, such as yellow or cyan inks. In another example, the fusing radiation absorption properties may vary depending upon the chemical compositions of the fusing agents. For instance, a first fusing agent having a particular additive or catalyst may have a higher fusing radiation absorption rate than a second fusing agent that does not have the particular additive or catalyst or has a different additive or catalyst. - The fusing agent may include a heat- or radiation-absorbing agent (i.e., an active material). The active material may be any suitable material that absorbs heat and/or electromagnetic radiation. The active material may be selected to absorb heat and/or any wavelength in the electromagnetic spectrum. As examples, the electromagnetic radiation absorber may absorb IR radiation (i.e., a wavelength of about 700 nm to about 1 mm, which includes near-IR radiation (i.e., a wavelength of 700 nm to 1.4 µm)), ultraviolet radiation (i.e., a wavelength of about 10 nm to about 390 nm), visible radiation (i.e., a wavelength from about 390 nm to about 700 nm), microwave radiation (i.e., a wavelength of about 1 mm to 1 about m), radio radiation (i.e., a wavelength from about 1 m to about 1000 m), or a combination thereof. An example of the active material may be a microwave radiation-absorbing susceptor, such as carbon black, graphite, magnetite, and/or various iron oxides. Carbon black may also be used as an IR (including near-IR) radiation absorber. Examples of other suitable radiation absorbers include visible dyes, or IR dyes, or any suitable colorants having radiation absorption bands within the visible spectrum of electromagnetic radiation.
- As one example, the fusing agent may be an ink-type formulation including carbon black, such as, for example, the ink formulation commercially known as CM997A available from HP Inc. Within the fusing agent, the carbon black may be polymerically dispersed. The carbon black pigment may also be self-dispersed within the fusing agent (e.g., by chemically modifying the surface of the carbon black). Examples of inks including visible light enhancers are dye based colored ink and pigment based colored ink, such as the commercially available inks CE039A and CE042A, available from HP Inc.
- Examples of suitable carbon black pigments that may be included in the
fusing agent 170 include those manufactured by Mitsubishi Chemical Corporation, Japan (such as, e.g., carbon black No. 2300, No. 900, MCF88, No. 33, No. 40, No. 45, No. 52, MA7, MA8, MA100, and No. 2200B); various carbon black pigments of the RAVEN® series manufactured by Columbian Chemicals Company, Marietta, Georgia, (such as, e.g., RAVEN® 5750, RAVEN® 5250, RAVEN® 5000, RAVEN® 3500, RAVEN® 1255, and RAVEN® 700); various carbon black pigments of the REGAL® series, the MOGUL® series, or the MONARCH® series manufactured by Cabot Corporation, Boston, Massachusetts, (such as, e.g., REGAL® 400R, REGAL® 330R, and REGAL® 660R); and various black pigments manufactured by Evonik Degussa Corporation, Parsippany, New Jersey, (such as, e.g., Color Black FW1, Color Black FW2, Color Black FW2V, Color Black FW18, Color Black FW200, Color Black S150, Color Black S160, Color Black S170, PRINTEX® 35, PRINTEX® U, PRINTEX® V, PRINTEX® 140U, Special Black 5, Special Black 4A, and Special Black 4). - The carbon black pigment may be polymerically dispersed within the fusing
agent 170 by a polymeric dispersant having a weight average molecular weight ranging from about 12,000 to about 20,000. In this example, the fusing agent includes the carbon black pigment (which is not surface treated), the polymeric dispersant, and water (with or without a co-solvent). When included, an example of the co-solvent may be 2-pyrollidinone. The polymeric dispersant may be any styrene acrylate or any polyurethane having its weight average molecular weight ranging from about 12,000 to about 20,000. Some commercially available examples of the styrene acrylate polymeric dispersant are JONCRYL® 671 and JONCRYL® 683 (both available from BASF Corp.). Within the fusing agent, a ratio of the carbon black pigment to the polymeric dispersant may range from about 3.0 to about 4.0. In an example, the ratio of the carbon black pigment to the polymeric dispersant is about 3.6. The polymeric dispersant may contribute to the carbon black pigment's capability for exhibiting enhanced electromagnetic radiation absorption. - In another example, the fusing agent includes active material or materials, such as metal nanoparticles. In one example, the metal nanoparticles are silver (Ag), copper (Cu), or zinc (Zn). Other examples of suitable metal nanoparticles include metal alloys (where the metals are selected from, for example, Ag, Au, Cu, Ni, Rh, Ru, Mo, Ta, Ti, Pt, or Pd), metal oxide (e.g., iron oxide), metal coated oxide (e.g., iron oxide coated with Ag, Au or Pt), cadmium selenide, and metal coated silica (e.g., silica coated with Ag or Au).
- The amount of the active material that is present in the fusing agent may range from 0 wt% to about 40 wt% based on the total wt% of the fusing agent. In other examples, the amount of the active material in the fusing agent may range from about 0.3 wt% to 30 wt%, or from about 1 wt% to about 20 wt%. Generally speaking, the active material may provide a balance between the fusing agent having jetting reliability and heat and/or electromagnetic radiation absorbance efficiency.
- The presence of a co-solvent, a surfactant, and/or a dispersant in the fusing agent may assist in obtaining a particular wetting behavior with the
build materials 106. In some instances, the fusing agent includes water or other primary solvent, either alone or with the active material. In other instances, the fusing agent may further include a dispersing additive, a surfactant, a co-solvent, a biocide, an anti-kogation agent, and combinations thereof. - Surfactant(s) may be used to improve the wetting properties and the jettability of the fusing agent. Examples of suitable surfactants may include a self-emulsifiable, nonionic wetting agent based on acetylenic diol chemistry (e.g., SURFYNOL® SEF from Air Products and Chemicals, Inc.), a nonionic fluorosurfactant (e.g., CAPSTONE® fluorosurfactants from DuPont, previously known as ZONYL FSO), and combinations thereof. In other examples, the surfactant is an ethoxylated low-foam wetting agent (e.g., SURFYNOL® 440 or SURFYNOL® CT-111 from Air Products and Chemical Inc.) or an ethoxylated wetting agent and molecular defoamer (e.g., SURFYNOL® 420 from Air Products and Chemical Inc.). Still other suitable surfactants include non-ionic wetting agents and molecular defoamers (e.g., SURFYNOL® 104E from Air Products and Chemical Inc.) or water-soluble, non-ionic surfactants (e.g., TERGITOL™ TMN-6 from The Dow Chemical Company). In some examples, it may be desirable to utilize a surfactant having a hydrophilic-lipophilic balance (HLB) less than 10.
- Whether a single surfactant is used or a combination of surfactants is used, the total amount of surfactant(s) in the fusing agent may range from about 0.5 wt% to about 1.4 wt% based on the total wt% of the fusing agent.
- Some examples of the co-solvent (for the water-based fusing agent 170) include 1-(2-hydroxyethyl)-2-pyrollidinone, 2-Pyrrolidinone, 1,5-Pentanediol, Triethylene glycol, Tetraethylene glycol, 2-methyl-1,3-propanediol, 1,6-Hexanediol, Tripropylene glycol methyl ether, N-methylpyrrolidone, Ethoxylated Glycerol-1 (LEG-1), and combinations thereof.
- Examples of suitable biocides include an aqueous solution of 1,2-benzisothiazolin-3-one (e.g., PROXEL® GXL from Arch Chemicals, Inc.), quaternary ammonium compounds (e.g., BARDAC® 2250 and 2280, BARQUAT® 50-65B, and CARBOQUAT® 250-T, all from Lonza Ltd. Corp.), and an aqueous solution of methylisothiazolone (e.g., KORDEK® MLX from The Dow Chemical Co.). The biocide or antimicrobial may be added in any amount ranging from about 0.05 wt% to about 0.5 wt% with respect to the total wt% of the fusing agent.
- An anti-kogation agent may be included in the fusing agent. Kogation refers to the deposit of dried ink (e.g., fusing agent) on a heating element of a thermal inkjet printhead. Anti-kogation agent(s) is/are included to assist in preventing the buildup of kogation. Examples of suitable anti-kogation agents include oleth-3-phosphate (e.g., commercially available as CRODAFOS™ O3A or CRODAFOS™ N-3 acid from Croda), or a combination of oleth-3-phosphate and a low molecular weight (e.g., < 5,000) polyacrylic acid polymer (e.g., commercially available as CARBOSPERSE™ K-7028 Polyacrylate from Lubrizol). Whether a single anti-kogation agent is used or a combination of anti-kogation agents is used, the total amount of anti-kogation agent(s) in the fusing agent may range from greater than 0.20 wt% to about 0.62 wt% based on the total wt% of the fusing agent. In an example, the oleth-3-phosphate is included in an amount ranging from about 0.20 wt% to about 0.60 wt%, and the low molecular weight polyacrylic acid polymer is included in an amount ranging from about 0.005 wt% to about 0.015 wt%.
- It is to be understood that a single fusing agent may be selectively applied to form the layer of the 3D part, or multiple fusing agents may be selectively applied to form the layer of the 3D part. In addition, or alternatively, the choice of active materials to assist in the absorption of fusing radiation, co-solvents, surfactants, dispersants, and anti-kogation agents may be deterministically optimized for specific applications and/or materials.
- According to an example, the
controller 140 may determine the drop weights for the coolant droplets 172 to be deposited onto thebuild materials 106 in thesecond section 166 based upon the fusing radiation absorption rate of thefusing agent 170 deposited or to be deposited on thebuild materials 106 in thefirst section 164. Particularly, as discussed above, thecontroller 140 may determine the drop weights for the coolant droplets 172 to be drop weights that are to result in the thermal balance between thebuild materials 106 in thefirst section 164 and thebuild materials 106 in thesecond section 166. In addition, thecontroller 140 may control thesecond delivery device 132 to deposit the coolant droplets 172 at the determined drop weights onto thebuild materials 106 in thesecond section 166. - The coolant droplets 172 may be composed of any suitable liquid that is to cool the
build materials 106 and to prevent thebuild materials 106 from fusing together during application of fusing radiation onto thebuild materials 106. For instance, the coolant droplets 172 may be composed of a liquid that is to evaporate during application of the fusing radiation. In one regard, the coolant droplets 172 are to be substantially completely evaporated during application of the fusing radiation such that theunfused build materials 106 may be re-used. - The coolant droplets 172 may include water or other suitable liquid. In addition, the coolant droplets 172 may include a dispersing additive, a surfactant, a co-solvent, a biocide, an anti-kogation agent, and combinations thereof. The various examples of these elements described above with respect to the
fusing agent 170 may also be applicable to the coolant droplets 172. - Turning now to
FIG. 1C , there is shown a simplified diagram of thelayer 160 following application of fusingradiation 180 from the either or both of the first and second fusingradiation generators build materials 106 in thefirst section 164 may be fused together, while thebuild materials 106 in thesecond section 166 may remain unfused. Thus, the coolant droplets 172 may prevent thebuild materials 106 in thesecond section 166 from fusing together even though the same amount of fusingradiation 180 may have been applied to both thefirst section 164 and thesecond section 166. - With reference now to
FIG. 2 , there is shown a simplified top view of alayer 200 ofbuild materials 106 in which multiple 3D part areas 202-206 may be in the process of being formed. The areas 202-206 depicted inFIG. 2 may include different fusing characteristics with respect to each other. For instance, thebuild materials 106 in thefirst area 202 may be provided with afirst fusing agent 210, thebuild materials 106 in thearea 204 may be provided with asecond fusing agent 212, and thebuild materials 106 in the third area 206 may be provided with thefirst fusing agent 210 and thesecond fusing agent 212. Thefirst fusing agent 210 may have a lower fusing radiation absorption rate than thesecond fusing agent 212. By way of particular example, thefirst fusing agent 210 may have a lighter color than thesecond fusing agent 212. In other examples, however, thefirst fusing agent 210 and thesecond fusing agent 212 may have different compounds with respect to each other. - In one regard, in the example depicted in
FIG. 2 , thebuild materials 106 in thefirst area 202 that have received thefirst fusing agent 210 may require a greater amount of fusing radiation to be fused together than thebuild materials 106 in thesecond area 204 that have received thesecond fusing agent 212. In addition, some of thebuild materials 106 in the third area 206 that have received thefirst fusing agent 210 may require a greater amount of fusing radiation to be fused together than other ones of thebuild materials 106 in the third area 206 that have received thesecond fusing agent 212. Thus, for instance, thecontroller 140 may control either or both of the first and second fusingradiation generators first area 202 and the third area 206 as compared with thesecond area 204 as the first and second fusingradiation generators layer 200 in either or both of the directions indicated by thearrow 137. The amount of fusing radiation applied by the first and/or second fusingradiation generators radiation generators - According to an example, the
controller 140 may determine the amount of fusing radiation that is to be applied to each of thefirst area 202, thesecond area 204, and the third area 206 based upon the fusing radiation absorption rates of the fusingagents data store 150. Thecontroller 140 may determine the fusing radiation requirements for each of thefirst area 202 and thesecond area 204 for thebuild materials 106 to be fused in those areas based upon the stored fusing radiation absorption rates. In other examples, thecontroller 140 may access the fusing radiation absorption rates from a source over a network, from a user, etc. In any regard, in instances in which an area, such as the third area 206 has multiple fusingagents controller 140 may determine the amount of fusing radiation to be applied to be based upon thefusing agent 210 requiring the greatest amount of fusing radiation to cause thebuild materials 106 on which thefusing agent 210 is deposited to be fused together. - The
controller 140 may also determine the drop weights of the coolant droplets 172 (FIG. 1B ) that are to be respectively deposited onto thebuild materials 106 that are located adjacent to thefirst area 202, thesecond area 204, and the third area 206. Thecontroller 140 may predetermine the drop weights of the coolant droplets 172 that may result in the thermal balance or may determine the drop weights in real-time. For instance, thecontroller 140 may determine the drop weights of the coolant droplets 172 to be drop weights that may result in a thermal balance between thebuild materials 106 in the areas 202-206 and thebuild materials 106 in areas adjacent to the those areas 202-206. By way of example, thermal balance may be achieved when during application of fusing radiation by either or both of the first and second fusingradiation generators build materials 106 in the areas 202-206 are fused together while thebuild materials 106 adjacent to the areas 202-206 are not fused together. That is, for instance, thermal balance may be achieved when the coolant droplets 172 are of sufficient drop weights to sufficiently cool thebuild materials 106 adjacent to the areas 202-206 to prevent those buildmaterials 106 from fusing together while sufficient fusing radiation is supplied to thebuild materials 106 in the areas 202-206 to fuse those buildmaterials 106 together. Additionally, thermal balance may be achieved when following application of the fusing radiation, thebuild materials 106 in the locations outside of the areas 202-206 may be reused in a subsequent layer. That is, thermal balance may be achieved when there is an insufficient amount of leftover coolant on thebuild materials 106 to enable those buildmaterials 106 to be re-usable. - As different amounts of fusing radiation may be applied to the areas 202-206, the
controller 140 may determine different drop weights of the coolant droplets 172 to be applied to respective locations adjacent to the areas 202-206. For instance, thecontroller 140 may determine the drop weights of the coolant droplets 172 to be deposited in thelocations 218 adjacent to thefirst area 202 to have a first drop weight. Thecontroller 140 may also determine the drop weights of the coolant droplets 172 to be deposited in thelocations 218 adjacent to thesecond area 204 to have a second drop weight. Thecontroller 140 may further determine the drop weights of the coolant droplets 172 to be deposited in thelocations 220 to have the first drop weight. - The
controller 140 may control thefirst delivery device 130 to deliver the fusingagents layer 200 as shown inFIG. 2 . In addition, thecontroller 140 may control thesecond delivery device 132 to deliver the coolant droplets 172 to the selected locations 216-220 at their respective determined drop weights as also shown inFIG. 2 . Thecontroller 140 may also control either or both of the first and second fusingradiation generators layer 200 at respectively determined fusing radiation amounts to fuse thebuild materials 106 in the areas 202-206 while also preventing thebuild materials 106 outside of the areas 202-206 from being fused together. Thecontroller 140 may further control the formation and spreading of further layers ofbuild materials 106 and may repeat the process described above. - Turning now to
FIG. 3 , there is shown a simplified block diagram of anexample management apparatus 300 that may be implemented in the 3D printer depicted inFIG. 1A . In one example, themanagement apparatus 300 may form part of the3D printer 100 depicted inFIG. 1A . For instance, themanagement apparatus 300 may be a command module or other control system of the3D printer 100. It should be understood that themanagement apparatus 300 depicted inFIG. 3 may include additional components and that some of the components described herein may be removed and/or modified without departing from a scope of themanagement apparatus 300 disclosed herein. - The
management apparatus 300 depicted inFIG. 3 is shown as including acontroller 140 and adata store 150, which may be the same as thecontroller 140 anddata store 150 depicted in and described above with respect toFIG. 1A . As such, thecontroller 140 and thedata store 150 depicted inFIG. 3 are not described in detail and instead, the descriptions of thecontroller 140 and thedata store 150 provided above with respect to the3D printer 100 are intended to also describe these components with respect to themanagement apparatus 300. - As shown in
FIG. 3 , themanagement apparatus 300 may include a computerreadable storage medium 310 on which is stored machine readable instructions 312-326 (which may also be termed computer readable instructions) that thecontroller 140 may execute. More particularly, thecontroller 140 may fetch, decode, and execute the instructions 312-326 to access data pertaining to a 3D part to be printed 312, determine a fusing radiation absorption level of the fusing agent/access a temperature profile (and a fusing radiation absorption profile) across a build material layer following deposition of thefusing agent 314, determine drop weights (or drop volumes) of coolant droplets to be delivered onto selected areas of thebuild material layer 316, control a first delivery device to deliver afusing agent 318, control a second delivery device to deliver coolant droplets at the determined (or tuned)drop weights 320, control a fusing radiation generator to apply selected amounts of fusingradiation 322, control abuild area platform 324, and control arecoater 326. As an alternative or in addition to retrieving and executing instructions, thecontroller 140 may include one or more electronic circuits that include components for performing the functionalities of the instructions 312-326. In any regard, and as discussed above, thecontroller 140 may communicate instruction signals to the various components of the3D printer 100 via communication lines such that the components may operate in the manners described herein. - The computer
readable storage medium 310 may be any electronic, magnetic, optical, or other physical storage device that contains or stores executable instructions. Thus, the computerreadable storage medium 310 may be, for example, Random Access Memory (RAM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a storage device, an optical disc, and the like. The computerreadable storage medium 310 may be a non-transitory machine-readable storage medium, where the term "non-transitory" does not encompass transitory propagating signals. - Various manners in which the
management apparatus 300 may be implemented are discussed in greater detail with respect to themethods FIGS. 4 and5 . Particularly,FIGS. 4 and5 , respectively, depictexample methods build materials 106 that receive fusingagent droplets 170 and a second set ofbuild materials 106 that receive coolant droplets 172 during application of fusing radiation onto the first and second sets ofbuild materials 106. It should be apparent to those of ordinary skill in the art that themethods - The descriptions of the
methods 3D printer 100 illustrated inFIG. 1A and themanagement apparatus 300 illustrated inFIG. 3 for purposes of illustration. - Prior to execution of either of the
methods methods controller 140 may executeinstructions 312 stored on the computerreadable storage medium 310 to access data pertaining to a 3D part that is to be printed. By way of example, thecontroller 140 may access data stored in thedata store 150 pertaining to a 3D part that is to be printed. Thecontroller 140 may determine the number of layers ofbuild materials 106 that thefirst delivery device 130 is to form and the locations at which fusingagent droplets 170 is or droplets of multiple fusing agents are to be deposited on each of the respective layers ofbuild materials 106 in order to print the 3D part. Thecontroller 140 may further determine the amount of fusing radiation to be supplied onto different locations of each of the layers by the either or both of the first and second fusingradiation generators - With reference first to
FIG. 4 , atblock 402, fusingagent droplets 170 may be deposited onto a first set ofbuild materials 106 in abuild material layer 160, in which thefusing agent droplets 170 are to facilitate binding of the first set ofbuild materials 106 to each other through absorption of fusing radiation supplied by either or both of the first and second fusingradiation generators controller 140 may execute theinstructions 318 to control thefirst delivery device 130 to deposit the fusingagent droplets 170 onto afirst section 164 of thebuild material layer 160 as shown inFIG. 1B . - At
block 404, coolant droplets 172 may be deposited at tuned drop weights onto a second set ofbuild materials 106 of thebuild material layer 160, in which the coolant droplets 172 are tuned to have drop weights that result in a thermal balance between the first set ofbuild materials 106 and the second set ofbuild materials 106 during application of fusing radiation onto the build material layer by either or both of the first and second fusingradiation generators build materials 106 and the second set ofbuild materials 106 may be achieved in any of the manners discussed above. In addition, thecontroller 140 executes theinstructions 320 to control thesecond delivery device 132 to deposit the coolant droplets 172. - The
controller 140 may also determine the locations at which the coolant droplets 172 are to be deposited. For instance, thecontroller 140 may determine that the coolant droplets 172 are to be deposited onto thebuild materials 106 that are within a predetermined distance from the edges of thebuild materials 106. The predetermined distance may be determined through testing of various types of fusing agents and may also be based upon the type of fusing agent being deposited. - With reference now to
FIG. 5 , atblock 502, fusing radiation absorption levels of a first set ofbuild materials 106 following deposition of a fusing agent on the first set ofbuild materials 106 is determined. That is, thecontroller 140 may execute theinstructions 314 to determine what the fusing radiation absorption levels of the first set ofbuild materials 106 will likely be following deposition of the fusingagent droplets 170 onto those buildmaterials 106. As discussed above, thecontroller 140 may determine what the fusing radiation absorption levels will be based upon the fusing radiation absorption properties of the fusing agent. Thecontroller 140 may further determine a fusing radiation absorption profile of thebuild material layer 160 following deposition of the fusingagent droplets 170. That is, for instance, thecontroller 140 may determine the predicted fusing radiation absorption rates in various locations of thelayer 160 that are likely to exist following application of the fusingagent droplets 170 or droplets of multiple fusing agents onto thelayer 160. - In addition, at
block 502, a temperature profile across thebuild material layer 160 following deposition of the fusingagent droplets 170 may be accessed. In one example, the temperature profile across thebuild material layer 160 may be accessed through a direct measurement of the temperatures across thebuild material layer 160. In this example, thecontroller 140 may execute theinstructions 314 to access the temperatures across thebuild material layer 160 as detected by a temperature sensor (not shown). In addition, thecontroller 140 may predict the temperature profile of thebuild material layer 160 based upon the determined locations at which thefusing agent droplets 170 are to be deposited. Thus, for instance, thecontroller 140 may predict how the temperature may vary across thebuild material layer 160 depending upon the fusing radiation absorption properties of the fusing agent that is to be deposited onto thelayer 160. - That is, the
controller 140 may determine how the temperatures across thelayer 160 are predicted to increase following application of fusing radiation onto thelayer 160. As discussed above, different areas of thelayer 160 may be heated to different temperatures depending upon the fusing radiation absorption rates of the fusing agents deposited on those areas. For instance, a fusing agent with a relatively lower fusing radiation absorption rate may require a higher amount of fusing radiation to cause thebuild materials 106 upon which the fusing agent has been deposited to become fused together. In this regard, the locations around the areas in which a fusing agent with a relatively lower fusing radiation absorption rate has been deposited may be heated to a higher temperature as compared to locations around areas in which a fusing agent with a relatively higher fusing radiation absorption rate has been deposited. Thus, for instance, thecontroller 140 may determine the temperature profile based upon the predicted temperature levels at various locations across thelayer 160. - At
block 504, thecontroller 140 may determine the drop weights (or drop volumes) of the coolant droplets 172 to be selectively deposited onto a second set ofbuild materials 106 to reach a thermal balance between the first set ofbuild materials 106 and the second set ofbuild materials 106. A description of the thermal balance those described above with respect toFIG. 1B . In addition, thecontroller 140 may execute theinstructions 316 to determine the drop weights of the coolant droplets 172. Thecontroller 140 may determine the drop weights (or drop volumes) based upon a determined fusing radiation absorption levels, a determined fusing radiation absorption profile. - At block 506, fusing
agent droplets 170 may be deposited onto a first set ofbuild materials 106 in abuild material layer 160, in which the fusing agent is to facilitate binding of the first set ofbuild materials 106 to each other through absorption of fusing radiation supplied by a fusingradiation generator 134. For instance, thecontroller 140 may execute theinstructions 318 to control thefirst delivery device 130 to deposit the fusingagent droplets 170 onto afirst section 164 of thebuild material layer 160 as shown inFIG. 1B . That is, thecontroller 140 may control thefirst delivery device 130 to deposit the fusingagent droplets 170 onto areas of thelayer 160 that are to form part of a 3D printed part. The sequence of at which liquid droplets (e.g., fusing agent droplets and/or coolant droplets), if multiple droplets are deposited, or the order of the liquid drops if different materials are used in each of them, may be optimized for improving resolution/definition between to-be-fused areas and to-be-not-fused areas. The order in which the liquid droplets are deposited may be based on relative wicking of the liquid droplets due to differences in viscosity, permeability of the liquid droplets, etc. - At
block 508, coolant droplets 172 may be selectively deposited onto a second set ofbuild materials 106 in thebuild material layer 160 at the tuned (or determined) drop weights. For instance, thecontroller 140 executes theinstructions 320 to control thesecond delivery device 132 to deposit the coolant droplets 172 at the determined drop weights to achieve thermal balance between the first set and the second set ofbuild materials - At
block 510, fusing radiation may be applied onto the first section and the second section of thebuild material layer 160. For instance, thecontroller 140 may execute theinstructions 322 to control the fusingradiation generator build material layer 160. According to an example, and as discussed above, thecontroller 140 may selectively apply different amounts of fusing radiation onto different areas of thelayer 160 depending upon, for instance, the fusing radiation absorption properties of the fusing agents deposited onto those different areas. - At
block 512, thecontroller 140 may determine whether anadditional layer 160 is to be formed, for instance, based upon accessed information regarding the 3D part to be printed. In response to a determination that anadditional layer 160 is to be formed, a next layer ofbuild materials 106 may be spread on top of theprevious layer 160, as indicated atblock 514. For instance, thecontroller 140 may execute theinstructions 324 to control thebuild area platform 102 to be moved downward and may execute theinstructions 326 to control therecoater 108 to spreadbuild materials 106 across theprevious layer 160. In addition, blocks 502-514 may be repeated until no additional layers are to be formed, at which point themethod 500 may end, as indicated atblock 516. - Some or all of the operations set forth in the
methods methods - Examples of non-transitory computer readable storage media include computer system RAM, ROM, EPROM, EEPROM, and magnetic or optical disks or tapes. It is therefore to be understood that any electronic device capable of executing the above-described functions may perform those functions enumerated above.
- Although described specifically throughout the entirety of the instant disclosure, representative examples of the present disclosure have utility over a wide range of applications, and the above discussion is not intended and should not be construed to be limiting, but is offered as an illustrative discussion of aspects of the disclosure.
- What has been described and illustrated herein is an example of the disclosure along with some of its variations. The terms, descriptions and figures used herein are set forth by way of illustration only and are not meant as limitations. Many variations are possible within the scope of the invention, which is intended to be defined by the following claims.
Claims (14)
- A three-dimensional (3D) printer (100) comprising:a first delivery device (130) to selectively deposit a fusing agent (170, 210, 212) onto a layer (114, 160, 200) of build materials (106) to facilitate binding of the build materials to each other through absorption of fusing radiation supplied by a fusing radiation generator (134, 136);a second delivery device (132) to deposit coolant droplets (172) at tuned drop weights onto the layer of build materials (114, 160, 200);a fusing radiation generator (134, 136) to apply fusing radiation onto the layer (114) of build materials (106); anda controller (140) to control the second delivery device (132) to selectively deposit the coolant droplets (172) at the tuned drop weights onto selected areas of the build material layer (114, 160, 200), characterized in thatthe drop weights of the selectively deposited coolant droplets are tuned by the controller based upon a fusing radiation absorption property of the fusing agent to provide a thermal balance between multiple areas of the build material layer (114, 160, 200) during application of fusing radiation onto the build material layer (114, 160, 200).
- The 3D printer (100) according to claim 1, wherein the controller (140) is to determine fusing radiation absorption levels at the multiple areas of the build material layer (114, 160, 200) at which the fusing agent (170, 210, 212) is to be selectively deposited and to determine the drop weights of the coolant droplets (172) to be selectively deposited onto the selected areas to reach the thermal balance between the multiple areas based upon the determined fusing radiation absorption levels at the multiple areas.
- The 3D printer (100) according to claim 2, wherein fusing agents (170, 210, 212) having different fusing radiation absorption properties with respect to each other are deposited onto the multiple areas of the build material layer (114, 160, 200) and wherein the controller (140) is to determine respective fusing radiation absorption levels at the multiple areas based upon the fusing agents applied to the multiple areas.
- The 3D printer (100) according to claim 2, wherein the fusing agent (170, 210, 212) is to be deposited to a first area (164) of the multiple areas and wherein the coolant droplets (172) are to be deposited onto a second area (166) of the multiple areas adjacent to the first area (164), and wherein the controller (140) is to thermally balance the first area (164) and the second area (166) by determining the drop weights of the coolant droplets (172) to be of a tuned size that is to cause the build materials (106) in the second area (166) to remain unfused to each other while the build materials (106) in the first area (164) are fused together through absorption of fusing radiation.
- The 3D printer (100) according to claim 2, further comprising:a temperature sensor to detect a temperature profile across the build material layer; andwherein the controller (140) is to determine the drop weights of the coolant droplets (172) based upon the detected temperature profile across the build material layer (114, 160, 200).
- The 3D printer (100) according to claim 2, wherein the controller (140) is to predict a temperature profile across the build material layer (114, 160, 200), wherein the predicted temperature profile is of the build material layer (114, 160, 200) following selective deposition of the fusing agent (170, 210, 212) on the build material layer (114, 160, 200), and wherein the controller (140) is to determine the drop weights of the coolant droplets (172) based upon the predicted temperature profile across the build material layer (114, 160, 200).
- The 3D printer (100) according to claim 2, wherein the controller (140) is to determine the drop weights to be relatively larger for the coolant droplets (172) that are to be deposited on a first selected area (216) that is adjacent to a first fusing area (202) that is to receive a greater amount of fusing radiation than the coolant droplets (172) that are to be deposited on a second selected area (218) that is adjacent to a second fusing area (204) that is to receive a lesser amount of fusing radiation.
- The 3D printer (100) according to claim 1, further comprising:
a carriage, wherein the second delivery device (132) is supported on the carriage and wherein the controller (140) is to control the carriage to be moved across the build material layer (114, 160, 200) and to control the second delivery device (132) to selectively deposit the coolant droplets (172) as the carriage is moved across the build material layer (114, 160, 200). - A method (400, 500) comprising:depositing (402) a fusing agent onto a first set of build materials in a build material layer, wherein the fusing agent is to facilitate binding of the first set of build materials to each other through absorption of fusing radiation supplied by a fusing radiation generator;the method being characterized by the steps of:determining (502) a fusing radiation absorption level of the fusing agent;determining (504) drop weights of coolant droplets to be selectively deposited onto a second set of build materials to reach the thermal balance between the first set of build materials and the second set of build materials based upon the determined fusing radiation absorption level of the fusing agent; anddepositing (404) the coolant droplets at tuned drop weights onto the second set of build materials of the build material layer, wherein the coolant droplets are tuned to have drop volumes that result in a thermal balance between the first set of build materials and the second set of build materials during application of fusing radiation onto the build material layer by the fusing radiation generator.
- The method (400, 500) according to claim 9, wherein depositing (404) coolant droplets further comprises depositing coolant droplets at a higher tuned drop weight onto a first subset of the second set of build materials and at a lower tuned drop weight onto a second subset of the second set of build materials, wherein the first subset of the second set of build materials is to receive a greater amount of fusing radiation than the second subset of the second set of build materials.
- The method (400, 500) according to claim 9, further comprising:accessing (502) a temperature profile across the build material layer following deposition of the fusing agent; anddetermining (504) the drop weights of the coolant droplets to be selectively deposited onto the second set of build materials to reach the thermal balance between the first set of build materials and the second set of build materials based upon the accessed temperature profile across the build material layer.
- The method (400, 500) according to claim 9, further comprising:accessing (504) a predicted temperature profile across the build material layer, wherein the predicted temperature profile is of the build material layer following selective deposition of the fusing agent on the build material layer; anddetermining (504) the drop weights of the coolant droplets to be selectively deposited onto the second set of build materials to reach the thermal balance between the first set of build materials and the second set of build materials based upon the predicted temperature profile across the spread build material layer.
- The method (400, 500) according to claim 9, wherein a portion of the selected second area overlaps with a portion of the selected first area and wherein depositing the coolant droplets further comprises depositing the coolant droplets onto the portion of the selected first area that overlaps with the portion of the selected second area to thereby deposit fusing agent and coolant droplets onto the overlapping portion.
- A non-transitory computer readable medium (310) on which is stored machine readable instructions (312 - 326) that when executed by a processor, cause the processor to:determine (314) a fusing radiation absorption profile of a build material layer based upon a fusing radiation absorption property of a fusing agent to be deposited or has been deposited, wherein the fusing radiation absorption profile identifies fusing radiation absorption levels at multiple areas of the build material layer at which a fusing agent is to be deposited or has been deposited;determine (316) drop weights of coolant droplets to be selectively deposited onto the build material layer based upon the determined fusing radiation absorption profile, wherein the drop weights of the coolant droplets are determined to result in a thermal balance between a first set of build materials that are to receive the fusing agent and a second set of build materials that are to receive the coolant droplets during application of fusing radiation onto the build material layer by a fusing radiation generator; andoutput an instruction to a coolant delivery device to selectively deposit the coolant droplets onto the build material layer at the determined drop weights.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2016/032885 WO2017200533A1 (en) | 2016-05-17 | 2016-05-17 | 3d printer with tuned coolant droplets |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3458250A1 EP3458250A1 (en) | 2019-03-27 |
EP3458250A4 EP3458250A4 (en) | 2020-01-08 |
EP3458250B1 true EP3458250B1 (en) | 2021-07-28 |
Family
ID=60325467
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16902578.0A Active EP3458250B1 (en) | 2016-05-17 | 2016-05-17 | 3d printer with tuned coolant droplets |
Country Status (4)
Country | Link |
---|---|
US (1) | US11084210B2 (en) |
EP (1) | EP3458250B1 (en) |
CN (1) | CN108602265B (en) |
WO (1) | WO2017200533A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3713740A4 (en) * | 2018-04-06 | 2021-06-23 | Hewlett-Packard Development Company, L.P. | Configuring an additive manufacturing system |
JP7139720B2 (en) * | 2018-06-27 | 2022-09-21 | 株式会社リコー | Modeled article manufacturing method and modeled article manufacturing apparatus |
US20220080671A1 (en) * | 2018-12-31 | 2022-03-17 | Stratasys Ltd. | Method and system for controlling a cooling system in three-dimensional printing |
CN113498378B (en) | 2019-03-15 | 2023-12-01 | 惠普发展公司,有限责任合伙企业 | Color object generation |
US11945168B2 (en) | 2019-04-30 | 2024-04-02 | Hewlett-Packard Development Company, L.P. | Colored object generation |
WO2020226608A1 (en) | 2019-05-03 | 2020-11-12 | Hewlett-Packard Development Company, L.P. | Agent composition determination based on thermal values |
EP4010169A4 (en) * | 2019-08-06 | 2023-05-03 | Hewlett-Packard Development Company, L.P. | Three-dimensional printing with polyelectrolytes |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030114936A1 (en) | 1998-10-12 | 2003-06-19 | Therics, Inc. | Complex three-dimensional composite scaffold resistant to delimination |
US6572807B1 (en) * | 2000-10-26 | 2003-06-03 | 3D Systems, Inc. | Method of improving surfaces in selective deposition modeling |
EP1534461B1 (en) | 2002-07-23 | 2010-06-16 | University Of Southern California | Metallic parts fabrication using selective inhibition of sintering (sis) |
JP2004345179A (en) * | 2003-05-21 | 2004-12-09 | Fuji Photo Film Co Ltd | Thermal printer and its cooling fan controlling method |
DE102004012682A1 (en) | 2004-03-16 | 2005-10-06 | Degussa Ag | Process for the production of three-dimensional objects by means of laser technology and application of an absorber by inkjet method |
US7261542B2 (en) * | 2004-03-18 | 2007-08-28 | Desktop Factory, Inc. | Apparatus for three dimensional printing using image layers |
US9156283B2 (en) * | 2013-06-18 | 2015-10-13 | Ricoh Company, Ltd. | Liquid dispersal in radiant dryers for printing systems |
WO2015100086A1 (en) * | 2013-12-23 | 2015-07-02 | The Exone Company | Methods and systems for three-dimensional printing utilizing multiple binder fluids |
JP6353547B2 (en) * | 2014-01-16 | 2018-07-04 | ヒューレット−パッカード デベロップメント カンパニー エル.ピー.Hewlett‐Packard Development Company, L.P. | 3D object generation |
JP6519100B2 (en) | 2014-04-23 | 2019-05-29 | セイコーエプソン株式会社 | Sinter-forming method, liquid binder, and sinter-formed product |
KR102180185B1 (en) | 2014-04-30 | 2020-11-18 | 휴렛-팩커드 디벨롭먼트 컴퍼니, 엘.피. | Computational model and three-dimensional (3d) printing methods |
CN106255582B (en) * | 2014-04-30 | 2018-11-06 | 惠普发展公司,有限责任合伙企业 | Three-dimensional (3D) printing process |
WO2015170330A1 (en) | 2014-05-08 | 2015-11-12 | Stratasys Ltd. | Method and apparatus for 3d printing by selective sintering |
US20150367418A1 (en) | 2014-06-20 | 2015-12-24 | Velo3D, Inc. | Apparatuses, systems and methods for three-dimensional printing |
CN107073827B (en) * | 2014-09-26 | 2022-06-10 | 惠普发展公司有限责任合伙企业 | Illumination for additive manufacturing |
-
2016
- 2016-05-17 US US16/072,169 patent/US11084210B2/en active Active
- 2016-05-17 EP EP16902578.0A patent/EP3458250B1/en active Active
- 2016-05-17 CN CN201680080609.1A patent/CN108602265B/en active Active
- 2016-05-17 WO PCT/US2016/032885 patent/WO2017200533A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
CN108602265B (en) | 2020-09-08 |
EP3458250A1 (en) | 2019-03-27 |
WO2017200533A1 (en) | 2017-11-23 |
EP3458250A4 (en) | 2020-01-08 |
US11084210B2 (en) | 2021-08-10 |
CN108602265A (en) | 2018-09-28 |
US20190030797A1 (en) | 2019-01-31 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP3458250B1 (en) | 3d printer with tuned coolant droplets | |
US10974450B2 (en) | 3D printer with tuned fusing radiation emission | |
CN111356738B (en) | Anti-coalescing agent for three-dimensional printing | |
US20210229358A1 (en) | Three-dimensional (3d) printing | |
US10850446B2 (en) | Three-dimensional (3D) printing with epoxy mold compound | |
EP3200980B1 (en) | Particle compositions for three-dimensional printing | |
EP3337651B1 (en) | Three-dimensional (3d) printing | |
EP3200977B1 (en) | Three-dimensional (3d) printing system | |
US20170252974A1 (en) | Three-dimensional (3d) printing method | |
EP3365153A1 (en) | Three-dimensional (3d) printing | |
US11179904B2 (en) | Three-dimensional (3D) part finishing system | |
US11787938B2 (en) | Three-dimensional (3D) printing | |
US11738508B2 (en) | Three-dimensional printing | |
EP3519157B1 (en) | 3d printing |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20180723 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R079 Ref document number: 602016061422 Country of ref document: DE Free format text: PREVIOUS MAIN CLASS: B29C0067000000 Ipc: B33Y0010000000 |
|
A4 | Supplementary search report drawn up and despatched |
Effective date: 20191211 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: B33Y 10/00 20150101AFI20191205BHEP Ipc: B33Y 40/00 20150101ALI20191205BHEP Ipc: B33Y 50/02 20150101ALI20191205BHEP Ipc: B33Y 30/00 20150101ALI20191205BHEP Ipc: B29C 64/165 20170101ALI20191205BHEP Ipc: B29C 64/393 20170101ALI20191205BHEP |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: GRANT OF PATENT IS INTENDED |
|
INTG | Intention to grant announced |
Effective date: 20210507 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE PATENT HAS BEEN GRANTED |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: REF Ref document number: 1414373 Country of ref document: AT Kind code of ref document: T Effective date: 20210815 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602016061422 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG9D |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: MP Effective date: 20210728 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK05 Ref document number: 1414373 Country of ref document: AT Kind code of ref document: T Effective date: 20210728 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: RS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210728 Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210728 Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210728 Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20211028 Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210728 Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210728 Ref country code: NO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20211028 Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20211129 Ref country code: HR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210728 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210728 Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210728 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210728 Ref country code: LV Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210728 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20211029 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210728 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 602016061422 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SM Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210728 Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210728 Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210728 Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210728 Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210728 Ref country code: AL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210728 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20220429 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210728 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
REG | Reference to a national code |
Ref country code: BE Ref legal event code: MM Effective date: 20220531 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210728 Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20220517 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20220531 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20220531 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20220517 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20220531 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20230420 Year of fee payment: 8 Ref country code: DE Payment date: 20230419 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20230420 Year of fee payment: 8 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: HU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO Effective date: 20160517 |